Ralph and Smith are flatmates and best mates. Nothing can come between them - until the gorgeous Jemima moves in. They're both falling for her, but which one of them does Jem want?

Upstairs, Karl and Siobhan are happily unmarried and have been for fifteen years - until Cheri moves into the flat above, and fixes her sights on Karl. Why should a little problem like his girlfriend get in her way?

Sooner or later this house is bound to implode. So what could possibly go wrong when Ralph throws his party?