When Amelia Hanson is going to be on a schooltrip with her class, and her parents aren't at home (they're on vacation while she is stuck here with 'Satan' as she claims) she asks her best friend Sienna to babysit Amelia's little brother. Sienna assumes that looking after Amelia's brother with her boyfriend will be all effortless; Amelia's assured that the schooltrip will be so much fun. But when has chaos and trouble ever left them behind?