When a flash flood leaves Zack and his younger foster brother stranded at home, it's up to Zack to make sure they survive.

Seventeen-year-old Zack has been living with his foster parents, the Tates, for three years. He used to be an angry mess with a broken heart, but with their love and support he's doing better now—and managing his ADHD. His foster brother, troubled fourteen-year-old Peter, arrived three months ago. Struggling with ADHD and fetal alcohol spectrum disorder, Peter reminds Zach of himself before the Tates took him in.

During a massive rainstorm, Peter runs away. While the Tates are out searching for him, the town announces a mandatory emergency evacuation. The river is flooding! Peter finally shows up and Zack takes charge, gathering supplies and trying to make sure Peter is okay. As the water rises, Zack and Peter have to figure out whether to sit tight and wait or try to escape...before they get washed away.