The outliers
(Book)

"It all starts with a text: Please, Wylie, I need your help. Wylie hasnt heard from Cassie in over a week, not since their last fight. But that doesnt matter. Cassies in trouble, so Wylie decides to do what she has done so many times before: save her best friend from herself. This time its 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 doesnt 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 isnt Cassie telling them? And could finding her be only the beginning?" --,(Source of summary not specified)