In early March, Priya and her mother, Deshani, walk together in Huntington, Colorado, visiting the empty chess pavilion where Priya plays with local veterans. Priya mentions that Landon, a chess player who has been following her into Starbucks, is making her uncomfortable. After shopping at Kroger, they find jonquils on their doorstep with a card bearing Priya’s name in blue ink. Recognizing the flowers from San Diego, Priya photographs them as evidence. Deshani suspects the killer may have found them. They text Agent Eddison, who calls and asks Priya to find her journal entries about the San Diego flower deliveries. He offers to tell her about the other cases in person. Priya lies, claiming she does not remember what other flowers they received, because she and her mother want more time to make their own plans before the FBI gets too involved. After the call, Deshani tells Priya she must decide whether to learn more, but Priya wants more information first.

The narrative shifts to Eddison in a Quantico conference room with Vic and Ramirez. Vic’s former partner, Takashi Finnegan, an agent in the Denver office, calls to report the Sravastis are safe and that the card and outer tissue paper have no prints. He sends a photo of Priya’s massive journal collection and warns them about Martha Ward, the new Denver Section Chief. Vic explains that Ward is a rigid profiler who refuses to accept pattern deviations. Since the killer has never sent flowers to a victim before killing them, Ward is likely to block the investigation. Vic recounts a Minnesota case where Ward’s refusal to collaborate resulted in additional deaths and Finnegan’s punitive transfer to Denver. Eddison texts Priya, and Deshani promises to watch over her. Ramirez suggests giving Priya a baseball bat.

A second-person killer interlude recalls stalking Libba Laughran, a 14-year-old girl, judging her sexual relationship with her boyfriend. The killer rapes and murders her, staging her body on a church floor with red-tipped white carnations.

Unable to sleep, Priya goes downstairs. A shadow on the banister triggers a memory of finding her father’s body hanging there on her birthday, two days before the first anniversary of Chavi’s death. Vic visited them at a hotel that night; Eddison sent 12 individually packaged baggies of Oreos, rationed by date. In the present, Priya fights the urge to eat in response to distress. Deshani finds her and suggests eating leftover chocolate ganache with bananas instead, helping her manage the urge. They begin sorting Priya’s journals to find the San Diego entries.

The next day, Priya attends chess, photographing the veterans and getting clear shots of Landon. Inside Starbucks, Joshua, an acquaintance, sits with her to shield her from Landon. Priya reads her San Diego journals, which detail flower deliveries: jonquils, calla lilies, baby’s breath, honeysuckle, freesia, and red-tipped carnations. The last arrived before they moved. She recalls learning a week later that her friend Aimée Browder had been murdered.

Eddison receives a call from Inara Morrissey, a Butterfly Garden survivor, who cancels her visit because her roommate Bliss is struggling. Inara reveals she has received four unopened letters from Desmond MacIntosh, the Gardener’s son. Eddison arranges for her to drop them at the New York FBI office.

On Thursday, purple-throated calla lilies arrive. Priya texts Eddison, asking him to tell her the rest. Agents Sterling and Archer from Denver arrive to collect the flowers and install security cameras. Archer reveals he studied Chavi’s case at the academy and makes inappropriate remarks about the case. Sterling privately offers to speak to him. Priya visits a local chapel with stained-glass windows, takes photos, and reads Inara’s letter expressing frustration with the legal process and questioning whether justice has real meaning.

Eddison picks Priya up, and they wait for Deshani. Eddison explains each of the killer’s 16 victims was left with a specific flower, and the deliveries follow the murder sequence. The first victim had jonquils; the second, calla lilies. He identifies the San Diego victim as Aimée Browder; her flower was amaranth, also called Love-Lies-Bleeding. Eddison explains Ward may obstruct the investigation because the deliveries deviate from the established pattern. When Deshani asks why he came in person, Eddison promises to protect them face-to-face.

The next morning, Eddison accompanies Priya to chess. His presence unsettles Landon, who leaves early. Steven, a vet, tells Priya she should have reported Landon’s behavior. Eddison departs. Priya reads her journals from Washington, DC, reliving the phone call about Aimée’s murder and her most severe episode of distress-related eating. This prompted her and Deshani to research the victims, discovering the flower connection: Darla Jean Carmichael (jonquils), Zoraida Bourret (calla lilies), Leigh Clark (baby’s breath), Sasha Wolfson (honeysuckle), Mandy Perkins (freesia), and Libba Laughran (carnations). The next will be columbines for Emily Adams, a musician. Priya writes to Inara, confessing she no longer believes a trial would bring peace.

Eddison reroutes to New York. At Inara’s building, he drags a man he initially assumes is drunk from her door and meets another roommate, Whitney. On the roof, he tells Inara a judge granted a no-contact order against Desmond, whose letters included witness tampering. Inara explains she refused to read them because she no longer wants to understand her captors. Eddison accompanies Inara and her roommates to The Evening Star restaurant, meeting owner Guilian. Bliss asks if Priya is okay; Eddison confirms.

A routine begins: Priya checks for flowers, does schoolwork, and reads her journals. Baby’s breath arrives, collected by Sterling and Archer. Archer suggests using Priya as bait; Sterling rejects this. Deshani suggests Priya decide whether to take Chavi’s journals to France. Honeysuckle arrives Friday, freesia Monday, carnations Wednesday.

Agent Finnegan comes for the carnations, absently revealing the next flower in the killer’s sequence will be columbines. He explains they identified the freesia deliverer: a college student paid anonymously. Priya reports Landon has not been seen in 10 days. Finnegan admits worry because Vic is uncharacteristically anxious. He reviews footage showing a gas station employee and leaves to investigate. He tells Priya not to blame herself for Aimée’s death.

Friday, blue and purple columbines arrive with a music-note ribbon, honoring Emily Adams. In Quantico, Eddison is disturbed by sunflowers on Ramirez’s desk. Vic announces Keely Rudolph, a 12-year-old Butterfly survivor, was attacked in Sharpsburg, Maryland. At the hospital, Inara explains a woman attacked Keely with a knife, calling her a “whore.” Inara, who may have broken the attacker’s nose, stopped the assault. Eddison gives Inara his sweater. She shows him a news article identifying Keely by name and school. Inara vents about the harassment Keely faces.

A killer interlude recalls stalking Laini Testerman, judging her revealing clothes. After watching her swim naked at the community pool, the killer retrieves hibiscus from a festival, kills her, and arranges flowers on her body.

Tuesday, marigolds arrive as the anniversaries of Chavi’s and her father’s deaths approach. Priya wears Chavi’s red fleece to chess. The vets confirm Landon has not returned. Walking home, Priya finds hibiscus. Eddison identifies them and insists that an agent stay until Deshani arrives. Priya discovers the security footage was hacked for 10 minutes. The flowers were delivered just before she arrived home, meaning the deliverer passed her in a car, a realization more frightening than previous incidents.