Kate and Mannix O’Brien’s autistic son Fergus is bullied at school, and their daughter Izzy wishes she could protect him. Kate is convinced her luck is about to change when she spots a gorgeous Manhattan apartment on a home-exchange website. Hazel and Oscar Harvey and their two children live on Manhattan’s Upper West Side. Though they seem successful and happy, Hazel has mysterious bruises, and Oscar is hiding things about his dental practice. Hazel has always wanted her children to see her native Limerick, and the house swap offers a perfect chance to soothe two troubled marriages. But this will be anything but a perfect vacation.