From New York Times bestselling author Kimberley McCreight comes the first book in a breathtakingly brilliant new trilogy, packed with tension, romance and thrilling twists and turns.

They'll get inside your head...

Imagine if you could see inside the minds of everyone around you - your best friend, your boyfriend, your enemies...?

Imagine how valuable you'd be...

Imagine how much danger you'd be in...

Imagine being an Outlier.

It all starts with a text:
Please Wylie, I need your help.

Wylie hasn't heard from her one time best friend, Cassie, in over a week. Not since their last fight. But that doesn't matter. Cassie's in trouble, and it's up to Wylie to do what she does best, save her best friend from herself.

This time it's different though - Cassie's texts are increasingly cryptic and scary. And instead of having Wylie come by herself, Jasper shows up saying Cassie asked him to help. Trusting the super-hot boy who sent Cassie off the rails doesn't feel right, but Wylie has no choice.

But as Wylie and Jasper follow Cassie's bizarre trail, Wylie has a growing sense that something is REALLY wrong. What isn't Cassie telling them? Who is she with and what do they want from her? And could finding her be just the beginning...?