A mysterious teenage boy leaves an FBI business card at Cassie's Colorado diner, giving her Agent Briggs's contact information.

Agent Briggs meets Cassie and offers her a place in a secret FBI program for teenagers with natural abilities at reading people.

Cassie tells her reluctant grandmother she is joining the Naturals program and flies to Quantico, Virginia.

Cassie arrives at the Naturals' Victorian house in Quantico and meets teammates Lia, Sloane, and Dean for the first time.

Agent Locke takes Cassie and Dean to a shopping mall to practice profiling strangers as their first formal training exercise.

During a Truth or Dare game, Lia dares Cassie to kiss Dean, visibly upsetting Michael.

Michael kisses Cassie after a late-night swim, leaving her confused about her feelings for him and Dean.

Reading prison interview files, Cassie discovers that Dean's father is prolific serial killer Daniel Redding.

Sloane steals a USB drive from Locke's briefcase containing classified files on the active serial killer investigation.

After reading the stolen files, Cassie concludes the UNSUB is targeting women who resemble her red-haired mother.

A gift box arrives at the house addressed to Cassie, containing a lock of red hair sent by the UNSUB.

The UNSUB mails a package to the house containing a photo of kidnapped senator's daughter Genevieve, bound and injured.

Locke secretly instructs Cassie to grab a gun from Briggs's safe and escape to a safe house with Dean.

Locke shoots Michael at the safe house and reveals herself as both the UNSUB and Cassie's biological aunt.

Michael regains consciousness and shoots Locke dead, and Cassie later chooses to remain in the Naturals program.

Cassie Hobbes is recruited into a secret FBI program after a mysterious teenage boy leaves an agent's business card at her Colorado diner. She joins the Naturals, a team of teens with extraordinary abilities, and relocates to a house in Quantico for training. As her feelings for teammates Michael and Dean grow complicated, she discovers a live serial killer case that appears directly connected to her mother's unsolved murder. After the UNSUB sends Cassie a lock of red hair and kidnaps a senator's daughter, the team races to uncover the killer's identity. Cassie and Dean are lured to a safe house where Agent Locke reveals herself as both the killer and Cassie's biological aunt. Michael saves Cassie's life by shooting Locke, and Cassie chooses to remain in the program despite the devastating revelations.

The headline events that carry Cassie from diner waitress to FBI program member and UNSUB survivor.

Cassie finds her name written on the back of the FBI business card and wonders if Agent Briggs has news about her missing mother.

Briggs explains that Michael reads emotions from gestures and expressions, while Cassie is a natural profiler suited to help catch serial killers.

Michael drives Cassie to the airport, and she deduces his expensive Porsche was kept as a deal for agreeing to join the program.

Cassie meets Agent Lacey Locke, Briggs's red-haired partner and FBI profiler, who will serve as her primary trainer.

Dean flips a switch revealing the house pool is painted with black-light blood splatter copied from a real crime scene.

Locke teaches Cassie and Dean that a serial killer's emotional signature stays consistent even when killing methods change.

During Truth or Dare, Dean reveals he secretly consulted on FBI cases with Briggs as an unofficial helper at age twelve.

Cassie confronts Dean about his father being a serial killer, and Dean rejects her reassurances and tells her to leave him alone.

Briggs discovers the teens accessed the stolen USB files and warns Cassie he will remove her from the program if she keeps investigating.

Cassie and Dean secretly analyze the stolen case files in the soundproof basement and agree the killings may connect to her mother.

The lock of red hair from the gift box is matched to the DNA of the UNSUB's most recent victim.

Lia gives Cassie a makeover and unknowingly applies the exact shade of red lipstick that Cassie's mother always wore.

At the club crime scene, Cassie spots graffiti in the bathroom and recognizes it as a coded message left by the UNSUB.

Police discover a dead body at an Arlington theater staged to replicate Cassie's mother's original bloody crime scene.

Cassie keeps the tube of Rose Red lipstick recovered from Locke's body and tells Lia she is staying in the program.

From the moment Cassie notices her name written on the back of the FBI card, she begins carefully sizing up Agent Briggs and his intentions. She meets Locke as her assigned trainer and receives her first real education in profiling alongside Dean, learning how serial killers leave consistent emotional signatures even when their methods evolve. Stolen USB files and tense confrontations with Briggs and Dean deepen her understanding of both the active case and her complicated teammates. The UNSUB's escalating gifts force the FBI to confirm Cassie is a target and place her under heavy surveillance. Cassie and the Naturals uncover staged crime scenes and chilling forensic details that inch them toward the truth. The story closes with Cassie holding onto a remnant of her mother and committing to stay in the program to find answers.

The training sessions, confrontations, and key discoveries that shaped Cassie's investigation from the inside.

Cassie ignores Michael's warning and calls Agent Briggs, agreeing to meet him at the Denver FBI field office.

Cassie's grandmother refuses to allow her to leave for the program, but Cassie firmly announces she is going anyway.

Unable to sleep, Cassie mentally slips into Lia's mind to profile her, then questions whether the exercise is imagination or real insight.

Cassie correctly identifies which three women from seven crime scene photos were killed by the same serial killer.

During Truth or Dare, Lia reveals that her real name is Sadie.

During Truth or Dare, Cassie describes the moment she discovered her mother's bloody crime scene to the other Naturals.

Late at night by the pool, Michael reveals he fears a profiler would expose his history of violently losing control.

Sloane admits to Cassie and Michael that she secretly stole a USB drive from Locke's briefcase and has been hiding it.

Cassie shows Michael and Sloane a photo of her red-haired mother and realizes the UNSUB is dyeing victims' hair to match her.

Dean secretly gives Cassie the official FBI file on her mother, and together they determine her killer is not the current UNSUB.

Sloane identifies that a blood smear on the staged crime scene's light switch proves the UNSUB accessed official police photographs.

Lia reveals the red lipstick appeared mysteriously on her bed, confirming the UNSUB has been physically inside the Naturals' house.

Michael arrives at the safe house pointing a gun at Dean, explaining he followed them because he feared Dean had kidnapped Cassie.

Locke reveals she and Cassie's mother grew up together in an abusive home and she joined the FBI to find Lorelai's killer.

Locke stabs Genevieve when Cassie refuses to kill her, then advances on Cassie before Michael shoots Locke multiple times.

Cassie's decision to call Agent Briggs despite Michael's warning sets the entire story in motion, and her firm stand against her grandmother's objections proves she is ready to take control of her own life. Inside the Naturals' house, charged moments of honesty during late-night conversations and a game of Truth or Dare expose painful histories, hidden names, and the complicated desires of every member of the group. A cascade of chilling realizations follows: that the UNSUB is recreating her mother's murder, that the killer has been inside their house, and that someone within the FBI is feeding the killer information. The confrontation at the safe house strips away every illusion, exposing Locke as the UNSUB and Cassie's long-lost aunt with a shared traumatic past. Michael's act of shooting Locke saves Cassie's life and forces the whole team to grapple with grief, guilt, and survival. Cassie emerges shaken but determined, choosing to continue her search for the truth.

The pivotal choices, hidden truths, and emotional breakthroughs that define the story's most critical twists.