Sixteen-year-old Toni Montgomery and her broken-footed best friend, Charlene, are aware that nothing happens in Dollop, Texas during the summertime. It's simply too hot. But when Toni gets hit by a suspicious white van and the man behind the wheel pulls her into his car to take her to the hospital, she discovers there might be entire cities within their reach. Because the man has a city - an entire city - inside his van. As Toni searches for the secret behind building a city in a van, Charlene's housing situation grows more and more uncertain until the need for a vehicle that can hold her entire family becomes dire. Now, Toni must find a way to save her summer and her friend at a time when nothing is quite as it seems.