Killer Instinct

Killer Instinct is the second book in Jennifer Lynn Barnes’s Naturals series. It follows Cassie Hobbes, a gifted profiler recruited into an elite FBI program, as she continues investigating cold cases and dangerous criminal behavior. In this installment, Cassie and her teammates are drawn into a new case involving a manipulative and unstable killer with ties to her mother’s murder, raising the stakes for both the team’s work and Cassie’s personal safety. The novel blends psychological suspense, criminal profiling, and teen mystery elements, continuing the series’ focus on a group of exceptional young investigators. The ISBN 9781786542229 is associated with the paperback edition published by Quercus Books and listed by Hachette UK as a Naturals novel, with publication details indicating a 2023 on-sale date and a page count of 352. The book is also described by retailers as part of the unputdownable mystery series from the author of The Inheritance Games. This makes it a young adult thriller centered on deduction, teamwork, and escalating danger, with the narrative built around the FBI-related profiling premise established in the first book.