The Naturals by Jennifer Lynn Barnes – Book 1 in the Bestselling YA Mystery & Profiling Series (Original English Edition).

"To catch a serial killer, you have to think like one."

Seventeen-year-old Cassie Hobbes has a natural talent: she can read people like open books. From the tilt of a chin to a subtle micro-expression, she instantly pieces together who people are and what they want. It’s an instinct that makes her extraordinary—and lands her an invitation into a secret, highly classified FBI program.

Known as "The Naturals," the group consists of gifted teenagers trained to analyze unsolved cold cases:

• Dean: A broody criminal profiler who understands the mind of killers far too well.

• Michael: An emotion-reader who can decode anyone's true feelings.

• Lia: A human lie detector with an uncanny knack for deceit.

• Sloane: A walking statistician who thrives on numbers and probabilities.

Though they are only supposed to study closed files, the stakes turn deadly when a copycat serial killer begins terrorizing the country. As the crimes mirror the unsolved murder of Cassie's mother, the teens realize they are no longer just solving the puzzle—they have become the target.