Her mom's remarriage has been hard on fifteen year old Shelby. Roger is strict and treats her like a child. At least they're letting her go to her first boy-girl party. That is until she gets home from school and finds that Roger has changed his mind—he wants Shelby to babysit her year-old brother Josh. It's so unfair! Fuming, Shelby takes Josh in his stroller to the park. After all, it's not his fault. Someone sets off fireworks, distracting Shelby. When she turns around—Josh is gone. Shelby tells the police she's seen a white van cruising the neighborhood lately, and she thinks she saw it at the park as well. But to her horror, the police are not interested: Pointing to angry texts to her girlfriends about getting back at Roger, they accuse her of causing Josh's disappearance! The police focus on the woods around the park, driving Shelby wild with fear and anger that the kidnappers will get away. With TV reporters all over the front yard, Shelby sneaks out the back to find her brother, any way she can.

So begins Shelby's race against time—and against a world that has turned on her. And yet she finds help along the way. There's mysterious Matt, who says he wants to help, but doesn't seem to want anyone to know it. And there's Jess, who watches out for Shelby as, against the odds, she tracks down the kidnappers down just as they are leaving town.