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A teen girl version of Dexter meets the high stakes danger and mystery of The Girl with the Dragon Tattoo in this riveting 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…

“S. E. Green spares no one in her debut, KILLER INSTINCT–unique, beautifully twisted, and rich in mystery.” ~Jennifer L. Armentrout, #1 NYT Bestselling Author 

“The ending literally left me with my mouth hanging open–not only was it shocking, it was more than a little gruesome and bloody. In a word, perfect.” ~Crimespree Magazine

“With an engaging and complex main character and a plot twist you’ll never see, Green’s first novel is to die for.” ~RT Reviews