Matt is a serial dater of girls half his age. Paul lives in a mysterious commune and is bafflingly secretive around his mother. Daniel spends his Saturday nights alone in his flat, pining for the love of his life, his ex-girlfriend Erin. Their mothers, three close friends, do not like what they see. Their sons are in their early 30s, and they expected them to be properly settled by now. So they launch a co-ordinated attack. They will arrive, without warning, and stay with their sons for one week in order to find out what went wrong, and try to put it right.