Ralph and Smith are flatmates and best mates—until, that is, the gorgeous Jemima moves in. Then suddenly they're bickering about a lot more than who drank the last beer. Of course, Jem knows that one of them is the man for her—but is it Ralph or Smith?

Upstairs, Karl and Siobhan have been happily unmarried for fifteen years—until, that is, Cheri moves into the flat above theirs. Cheri's got her eye on Karl and doesn't see why she should let a little thing like his girlfriend stand in her way...

Sooner or later it’s all got to come to a head—and what better place for tears and laughter, break ups and make ups than Ralph's party?