It's the summer of a never-ending drought, but storm clouds are gathering over Peter Grady. He hates his new home in a gated golf course community, his tag-along little sister thinks she is a superhero, and he's terrorized by Chipper Hoffman, a treacherous Eagle Scout. On top of all that, Peter's epileptic seizures are getting worse. But soon his neighbors' son, Josh, returns home under mysterious circumstances. When Josh reveals that he's building an ark, Peter doesn't know what to believe. Despite the community's outrage against Josh and his eyesore of an ark, Peter finds himself curiously drawn into Josh's lunatic plan.