"Sheltered seventeen-year-old Emmy's childhood best friend Oliver reappears after disappearing with his father ten years ago"--

Aliens have invade Earth, disguised as humans; Cassie is surviving solo in Southwestern Ohio, trying to escape notice and reunite with her father and brother. When she meets Evan Walker along the way, secluded in his family's farmhouse, she has to decide whether to trust him to help her find her family during this time when the enemy could be anyone.