Dutch tourists Lotte and Sven are pulled under Indian Lake while investigating mysterious lights from a canoe at night.

Jade argues with her father Tab on Friday the 13th and flees alone into the freezing night.

Jade cuts her wrists in the town canoe in a suicide attempt.

After returning from a psychiatric hospital, Jade meets new student Letha Mondragon in the school bathroom.

Mr. Holmes shows his history class ultralight footage revealing a massive pile of butchered elk near Terra Nova.

Jade watches the video on a recovered Dutch phone and witnesses the recorded murders of Lotte and Sven.

Letha Mondragon discovers Sven's decomposing body in Indian Lake while attending a teenage party.

Jade steals an audio recording from the sheriff's office revealing that Deacon Samuels was found torn apart.

Letha stages an intervention alongside Sheriff Hardy and Mr. Holmes, believing Jade's father has sexually abused her.

Sheriff Hardy bans Jade from attending the July Fourth celebration after realizing she has been spying on the case.

Jade discovers a construction worker's body with a nail through his head inside the Mondragon house.

The masked killer removes his gas mask outside the Mondragon home, revealing himself to be Theo Mondragon.

Theo Mondragon pursues Jade and Letha through the national forest with a chainsaw.

Stacey Graves rises from Indian Lake and attacks the townsfolk watching the outdoor movie, ripping off their lower jaws.

Jade pulls the ghost of Stacey Graves beneath the water and holds her until she goes still.

Two Dutch tourists are killed in Indian Lake before the story shifts to Jade Daniels, a slasher-obsessed outcast who attempts suicide and is hospitalized. After returning to school, Jade meets Letha Mondragon and becomes convinced that a real slasher film is unfolding in her town, with Letha as the destined final girl. Jade's investigation uncovers a series of deaths connected to the wealthy Founders of Terra Nova and reveals that Letha's father Theo is murdering construction workers to cover his tracks. During the Fourth of July massacre, the supernatural Lake Witch Stacey Graves also rises to attack the townspeople, proving that there are two killers at work. Jade must become the unexpected final girl, pulling Stacey beneath the water to save the town and confronting her abusive father in the chaos.

The core slasher story of Indian Lake's deadly summer.

At the Terra Nova construction site, Jade warms herself by a fire and recounts the story of slasher villain Cropsy to the workers.

Shooting Glasses offers Jade a ride home in an abandoned car that belonged to the murdered Dutch tourists.

Sheriff Hardy drives Jade back to school after her hospital stay and hands her an envelope containing her returned belongings.

Jade saves two fourth-grade girls from being struck by a school bus and is mistakenly cast as a hero.

Rexall is incorrectly credited for saving the children at graduation until another student points out it was Jade.

Mr. Holmes delivers a provocative graduation speech comparing the wealthy Founders to Greek gods and Incan aristocrats.

Tab Daniels is thrown out of the graduation ceremony for banging trash can lids together in applause.

Jade notices Theo Mondragon's boat anchored near the Camp Blood dock, surrounded by police and park rangers.

Clate Rodgers, who was present when Hardy's daughter drowned, is pulled into the Mondragon speedboat's propeller and killed.

Sheriff Hardy sits on his daughter's memorial bench and watches Clate Rodgers die without intervening.

Tab Daniels packs Jade's belongings into trash bags, kicking her out of the house.

Jade throws a machete toward Letha near the lake shore, and Letha catches it cleanly by the handle.

Letha takes Jade aboard the Mondragon yacht, feeds her, and gives her a safe place to sleep.

Jade and Letha wake on the yacht to discover all the adults on board have been violently murdered.

Jade breaks into the dam control booth with an axe and opens the dam to flood the town.

Before Jade is hospitalized, she visits the Terra Nova construction site and bonds with workers by retelling slasher lore, and is nearly taken home in a car belonging to the murdered tourists. After her return, Jade navigates the social world of Proofrock, saving children from a bus accident and watching the wealthy Founders arrive at graduation while her mother and abusive father hover at the edges of the ceremony. The summer brings new violence as Clate Rodgers is killed in a propeller accident that Hardy watches without intervening, and Tab kicks Jade out of their home entirely. Jade attempts to arm Letha by throwing her a machete before being arrested, then finds unexpected shelter on the Mondragon yacht before the night erupts into massacre. The pool concludes with Jade's desperate act of opening the dam to flood the town and stop a spreading forest fire.

The community moments and relationships surrounding the killings.

Jade finds a Dutch cellphone in the envelope of belongings returned to her after her hospitalization.

Local woman Christine Gillette tells Jade the story of Stacey Graves's jawless body being accidentally pulled from the lake.

Letha calls Jade and reveals that a human hand snuffed out the candle at Deacon Samuels's murder scene.

Mr. Holmes admits to Jade that he accidentally started the forest fire that destroyed the national forest when he was a child.

Sheriff Hardy reveals that Jade's mother took a young Jade to the doctor after she swallowed a bottle of aspirin.

Jade carves the words THE LAKE WITCH SLAYINGS into a school bathroom wall and is fired from her janitor job.

Shooting Glasses tells Jade that construction worker Greyson Brust fell into a hidden cave beneath the Terra Nova building site.

Sheriff Hardy imprisons Jade for the weekend to prevent her from attending the July Fourth celebration.

Mr. Holmes's ultralight aircraft crashes into Indian Lake after being shot down by Theo Mondragon.

Jade escapes the jail cell by slipping through a window while Hardy's secretary steps away from her desk.

Jade and Letha hide inside a cave packed with rotting elk carcasses and the bodies of murdered construction workers.

Jade shaves her head completely in the bathroom of the Mondragon yacht.

Jade confesses to a dying Mr. Holmes in the water that her father raped her when she was eleven.

Stacey Graves tears off Letha's jaw during the massacre, revealing that Letha is not the destined final girl.

Tiffany Koenig films Jade killing her father during the chaos, forcing Jade to flee into the woods toward Camp Blood.

Jade's investigation begins in earnest when she discovers the Dutch phone among her belongings and pieces together the legend of Stacey Graves from a local woman's testimony. Evidence mounts that the murders are human in origin when Letha reports a detail that rules out a bear attack, and the intervention scene forces long-buried truths about Jade's childhood to the surface. Jade is fired, jailed, and stripped of the last structures holding her life together, while the shooting down of Mr. Holmes's plane signals that Theo Mondragon is escalating. The escape from jail, the hiding in the elk-filled cave, and Jade's decision to shave her head mark her transformation from observer to participant. Jade's deathbed confession to Mr. Holmes, Stacey Graves's shattering of the final girl myth by breaking Letha's jaw, and Jade's capture on film after killing her father close the arc, leaving her a fugitive.