Madison Stokes leads a pretty average life, but all that changes when quiet, secretive Alyssa Hawkins moves to town. When Madison takes Alyssa under her wing, the two girls quickly become best friends. But Alyssa is harbouring a secret that could put their treasured friendship in jeopardy—and when Madison finds out by accident, Alyssa makes Madison promise not to tell anyone, not even Madison’s parents.