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Browse The Naturals series by Jennifer Lynn Barnes in order, with case by case summaries, series background, and advice on where to begin her FBI teen profiler thrillers.

Last updated: June 7, 2026

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Publication Order

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5 books

1

The Naturals

by Jennifer Lynn Barnes

2013

Seventeen year old Cassie Hobbes can read people with unsettling precision. Recruited into a secret FBI program for gifted teens, she joins a houseful of other Naturals and is quickly drawn into a serial killer case that feels disturbingly personal.

2

Killer Instinct

by Jennifer Lynn Barnes

2014

After barely surviving their first case, Cassie and the Naturals plan to stick to cold files. Then a new killer starts copying the methods of Dean’s notorious father, dragging the team into a live investigation and even darker psychological territory.

3

All In

by Jennifer Lynn Barnes

2015

A string of showy murders in Las Vegas sends Cassie and the Naturals to the Strip. The killer changes methods with every crime, leaving only coded number tattoos, while new evidence about Cassie’s mother threatens to break the team’s focus.

4

Bad Blood

by Jennifer Lynn Barnes

2016

Cassie finally gets a real lead on her mother’s disappearance and uncovers a secretive network of killers operating for generations. As bodies begin to appear, the Naturals must confront their own pasts while realizing someone is now hunting them.

5

Twelve

by Jennifer Lynn Barnes

2017

Years later, Cassie and her fellow Naturals run the FBI program themselves. A twelve year old girl threatens to jump from a lighthouse unless they investigate a cluster of teen deaths in Maine, forcing the team to face old ghosts.

Series background & context

The Naturals series centers on Cassie Hobbes, a teenager with an uncanny ability to read people. After years of using that skill to help her con artist mother, she is recruited by the FBI to join a classified program that trains gifted teens to profile criminals and solve cold cases.

Cassie moves into a house at Quantico with four other Naturals: Dean, another profiler with a dark family history; Michael, who reads emotions; Lia, a human lie detector and expert manipulator; and Sloane, a statistics savant who sees patterns everywhere. They work under the supervision of federal agents, but live more like a found family than a typical team.

Each book digs into a different case while peeling back more layers of the characters. In The Naturals, they hunt a serial killer whose crimes echo the unsolved murder of Cassie’s mother. Killer Instinct drags the group into an active investigation when a new killer starts copying the methods of Dean’s imprisoned father.

All In moves the action to Las Vegas, where a string of public murders tied to casinos and coded number tattoos forces the Naturals to confront a killer who treats the entire city like a puzzle. Bad Blood pulls together threads from the earlier books as Cassie finally gets close to the truth about her mother and the shadowy network of killers operating behind the scenes.

The novella Twelve revisits the characters as young adults who now run the Naturals program themselves. When a twelve year old girl in a coastal town threatens to jump from a lighthouse unless they investigate a rash of supposed suicides, Cassie and her friends have to face both a new mystery and old scars.

These stories are fast, tense, and often dark, with frank depictions of violent crime and trauma. At the same time, they are driven by friendships, banter, and the slow, sometimes painful work of building trust. Readers who enjoy procedural shows with a psychological slant will find a similar blend of crime solving and character study here.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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All 5 The Naturals Books in Order (Complete List 2026)