On Monday, Maeve hears a knock on her bedroom door and assumes it’s her mother, who likely heard her vomiting. Notifications accumulate on her phone as more people view an unspecified video. Leesa enters and asks if Maeve is unwell. Maeve denies it, hides her phone under her pillow, and is irritated by Aoife hovering outside the door. Leesa feels her forehead and notes that she’s clammy. Maeve momentarily craves her mother’s comfort but then imagines revealing the video and feels overwhelming shame. She lashes out at both Leesa and Aoife, demanding they leave. After Leesa exits and closes the door, Maeve curls into a ball and cries uncontrollably.

On Tuesday morning, Susan tracks Jon’s route to work before Leesa arrives. Leesa is unusually subdued and worried about Maeve, whom she heard vomiting and crying the previous night. She fears that Maeve is being bullied again, referencing past incidents with Nika and Ariana. Leesa considers asking Aoife to investigate Maeve’s social media for clues.

The sisters move to the back garden with coffee, and Susan places Bella on a playmat under a parasol. Susan doesn’t reveal her suspicions about Greta and Jon. When Leesa leaves, Susan rushes back to the garden and discovers that Bella is no longer in the shade—her cheeks and forehead are red. Confused, since Bella can’t yet roll over, Susan blames herself for misjudging how quickly the sun moved.

On Tuesday, Venetia stands outside her front door, her brief elation dissolving into grief. She recalls slipping through the unlocked side gate of Susan’s garden and moving Bella into direct sunlight, taking pleasure in imagining Susan’s reaction. Felipe opens the door and guides her inside, admitting that he was worried she might harm Susan, and asks her to promise to stay away. Venetia reflects on how the baby was confused but not fearful when she moved her, not yet understanding that humans can cause harm.

On Tuesday, Celeste notices that her sharpest kitchen knife is missing. Suspecting that her daughter may have taken it for self-harm, she searches Nika’s bedroom but finds nothing. She also notices that Cody has bruised knuckles, raising further concern.

On Tuesday evening, Leesa tells Maeve that Aoife identified Nika as the person behind the diary video. Leesa also mentions that Greta is downstairs and wants to see Maeve. After Leesa leaves, Maeve searches online for ways to kill Nika, including methods involving nut allergies, and has a flashback to their once-close childhood friendship. Greta enters, takes Maeve’s laptop away, and asks her to fetch her naltrexone from her bag downstairs. Maeve suspects that Greta is engineering time alone to search her room for signs of self-harm but complies. On her way out, she bumps into Aoife eavesdropping outside the door. Aoife’s awkward, consoling touch unexpectedly brings Maeve to tears again.

On Tuesday evening, Susan walks to Dún Laoghaire pier and encounters Felipe near Bar Four. He invites her for a drink, and they share a bottle of wine outside. Felipe asks if Susan has seen Venetia and appears relieved when she hasn’t. He reveals that his marriage to Venetia was arranged for visa purposes, though they did care for each other. He speaks emotionally about a cousin who died from a drug overdose and about Aimee and Venetia’s closeness. He then confesses that he believes the current trouble surrounding Aimee is his fault, though he doesn’t explain why. They part with an emotionally charged hug, and Susan feels comforted despite her growing concerns.

On Wednesday morning, Susan checks that Bella’s skin has returned to normal, remaining shaken by how easily her daughter could have been harmed. Determined to uncover the truth about Jon’s affair, she searches his belongings and finds a restaurant receipt hidden in his wardrobe—dinner for two at Peronique, with a note indicating that one diner had a tree-nut allergy. The detail leads Susan to realize who Jon’s affair partner is.

During a break at Wednesday’s hockey camp, Nika and her friend Jess enter the changing room. They find Greta, their coach, crouching on the floor with Nika’s open lunchbox. Nika sees ground almonds sprinkled on her brownie and accuses Greta of trying to exploit her allergy to kill her. Greta clutches the lunchbox and insists that it might be dangerous. Nika tells Jess that she needs to call her mother.

Celeste arrives at the hockey club after missing four calls from Nika. Nika accuses Greta of attempting to kill her with ground almonds. Greta denies it, claiming that she only suspected something was wrong with the lunch. Celeste examines the lunchbox, finds ground almonds on a brownie, and threatens to call the police. Nika quickly reverses her position, suggesting that Greta may have been trying to help, and Jess mentions a classmate who recently posted about nuts on social media. Celeste doesn’t believe the explanation but leaves with Nika, warning Greta that this isn’t the end of the matter.

Susan realizes that Jon’s affair partner was Savannah Holmes, remembering that Savannah publicly discussed her tree-nut allergy on social media. She also recalls that once, when Savannah’s packages were delivered to their house by mistake, Jon had returned one of them. Susan wonders whether Savannah was killed because someone mistook her for Susan or because of the affair with Jon. She considers whether Jon could be responsible but dismisses the idea, though she acknowledges that she didn’t think him capable of cheating either. Jon’s recent anxious behavior suggests that he knows his girlfriend was murdered, and Susan feels overwhelmed by the possibility that she may somehow be responsible for Savannah’s death.

The previous Tuesday evening, Savannah cycled home from the gym and left her bike at the front of the house. She texted Jon to see if he would visit but learned that he was working late and heading home. Savannah reflected on their relationship, wondering if she was falling for Jon. She admired the inscribed bracelet he gave her and glanced at her wedding photo with her ex-husband, Albie, thinking it may have been time to take it down.

On Wednesday, Susan sees a message from Celeste in the neighborhood group warning parents about an incident at Greta’s hockey camp involving Nika. She calls Greta, who explains the situation but sounds evasive. Susan then asks if Greta has seen Jon recently. Greta denies having seen him since Saturday. Susan knows this is a lie and can’t understand why her sister would cover for him.

On Wednesday evening, Jon sits in his car reviewing his affair with Savannah on a hidden second phone. He reads her final angry text, in which she threatened to call the police if he or another woman ever returned. Jon anonymously calls the police to report that Savannah’s ex-husband, Albie Byrne, was harassing her before her death.

When Jon exits the car, Leesa arrives and mentions that she babysat Bella the previous Wednesday while Susan was at her “physiotherapy” appointment. Jon knows this is a lie. “Physiotherapy” is their code word for marriage counseling, which they didn’t have that day. Alarmed by the discrepancy, he makes an excuse and drives away, concluding that he needs to speak with Greta.

Just after six o’clock on Wednesday evening, two police officers visit Venetia and Felipe. Detective Kellerman asks about Aimee’s marriage to Rory and reveals that a neighbor reported hearing shouting. Kellerman confirms that both Aimee and Rory were murdered and then asks if either of them knew Savannah Holmes. After the police leave, Felipe worries that Kellerman suspects something. Venetia insists that they’re safe as long as they maintain their alibi—that they were home together on Tuesday night. Felipe alludes to Rory as Aimee’s killer. Venetia blames Susan’s message for setting events in motion and senses that she’ll need to monitor Felipe closely.

The previous Tuesday night, Venetia walked home from her shift at Bar Four and checked her phone to find a viral Facebook post in a local group: a screenshot of a message revealing that Celeste’s husband, Warren Geary, was involved with a PR representative at the Bar Four opening party. The comments identified the woman as Aimee. Venetia dropped her cigarette and began running toward Aimee’s house.

On Wednesday, Warren confronts Celeste about her message in the neighborhood group accusing Greta of tampering with Nika’s lunch. He suggests that they shouldn’t make unfounded accusations if the incident was a misunderstanding. Celeste deflects by mentioning his affair with the woman from Bar Four. While passing Cody on the stairs, she notices that his bruised knuckles haven’t fully healed. She’s been avoiding confronting what she suspects about him—that he’s “damaged”—but she decides that she can no longer look away. She quietly enters his room to search it.

Jon sits in a parking lot, his mind racing. He recalls that Savannah was wearing the inscribed bracelet during their final argument, which means that she had it just before she died, yet the bracelet is now in Susan’s drawer. Adjusting his seat, he dislodges Savannah’s car keys from the footwell. He wipes them clean and disposes of them in a public trashcan along with his burner phone.

Celeste searches Cody’s bedroom and finds her missing kitchen knife under his pillow. Before she can process this, Cody walks in and confronts her. Celeste confiscates a vape and asks about his knuckles. He claims that he hit his hand on a wall and that the knife was for cutting an apple. He argues that losing his internship wasn’t entirely his fault and implies that Celeste shares blame for past decisions. When she tells him to take responsibility and be more like Nika, Cody warns her cryptically that she will soon see the truth about his sister.

On Wednesday, Leesa tells Susan that Jon seemed surprised to hear about her “physiotherapy” appointment the previous week. Later that night, Susan meets Felipe at Conways pub, where he talks warmly about his family, and she confides in him more openly than usual. She asks whether there could be a connection between her viral message and Aimee’s death. Felipe reveals that he forwarded a screenshot of Susan’s message to Rory because he was tired of Rory mocking Venetia. He confirms that both Aimee and Rory were murdered and tells Susan that her message had nothing to do with their deaths. He briefly reaches across to touch her hand. An hour later, in bed, Susan can still feel the touch of his fingers.

On Thursday morning, Venetia uses a leaflet drop as cover to approach Susan’s house. She unbolts the side gate, enters through the unlocked patio doors, and finds Bella awake in her bassinet in the living room. Venetia lifts the baby, holding her at arm’s length. Bella smiles at first, but her expression shifts to confusion when Venetia squeezes her. Venetia carries her outside through the side passage to the front garden, thinking that the baby will soon learn that humans should be feared.

The previous Tuesday night, after seeing the viral post about Aimee’s affair, Venetia rushed home. Felipe drove her to Aimee’s house, and she let herself in with a spare key. Upstairs, she heard snoring and felt momentary relief. She pushed open the bedroom door to find Aimee murdered across blood-soaked sheets, with a barbell nearby. Rory sat asleep in a chair. Rage overwhelmed Venetia. She picked up the barbell and struck Rory’s head repeatedly until Felipe pulled her away. Rory slumped to the floor. Venetia had two regrets: not making Aimee leave earlier that day and not making Rory suffer more before he died.