From the New York Times bestselling author of Reconstructing Amelia comes a fast-paced teen series where one girl learns that in a world of intrigue, betrayal, and deeply buried secrets, it is vital to trust your instincts.

It all starts with a text: Please, Wylie, I need your help. Wylie hasn't heard from Cassie in over a week, not since their last fight. But that doesn't matter. Cassie's in trouble, so Wylie decides to do what she has done so many times before: save her best friend from herself.

This time it's different, though. Instead of telling Wylie where she is, Cassie sends cryptic clues. And instead of having Wylie come by herself, Jasper shows up saying Cassie sent him to help. Trusting the guy who sent Cassie off the rails doesn't feel right, but Wylie has no choice but to ignore her gut instinct and go with him.

But figuring out where Cassie is goes from difficult to dangerous, fast. As Wylie and Jasper head farther and farther north into the dense woods of Maine, Wylie struggles to control her growing sense that something is really wrong. What isn't Cassie telling them? And could finding her be only the beginning?

In this breakneck tale, New York Times bestselling author Kimberly McCreight brilliantly chronicles a fateful journey that begins with a single decision—and ends up changing everything.