Killer Instinct

A teen girl version of Dexter meets the high stakes danger and mystery of The Girl with the Dragon Tattoo in this “unique, beautifully twisted, and rich” (#1 New York Times bestselling author, Jennifer L. Armentrout) debut.

Lane is a typical teenager. Loving family. Good grades. After-school job at the local animal hospital. Martial arts enthusiast. But her secret obsession is studying serial killers. She understands them, knows what makes them tick.

Why?

Because she might be one herself.

Lane channels her dark impulses by hunting criminals and delivering justice when the law fails. The vigilantism stops shy of murder, but with each visceral rush, the line of self-control blurs. And when a young preschool teacher goes missing—and returns in pieces—Lane gets a little too excited about tracking down “the Decapitator,” the vicious serial murderer who has come to her hometown.

As she gets dangerously caught up in a web of lies about her own past, Lane realizes she is no longer invisible or safe. Especially after the Decapitator contacts her directly. Now she needs to use her unique talents to find the true killer’s identity before she—or someone she loves—becomes the next victim…

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Published May 19, 2015

288 pages

Average rating: 6

1 RATING

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Community Reviews

Madeline Hillage
Jan 22, 2026
6/10 stars
I enjoyed most of the book, but the ending was not satisfying. There weren't enough hints to make her mother a reasonable suspect. I also didn't like Belinda. I felt that her character wasn't necessary. I liked Dr. Issa more than Zach too, but it was very out of character for him to suggest Lane beat up Belinda. Also, how would he explain how he knew she could? I liked most of the cases she went after except the animal-abuser one. I didn't like Daisy, partially because her character changed so much.

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