Who Killed Everybody?

A showgirl jumps out of a cake at a stag party, only to discover all the guests dead. Each of the four wealthy men had a wife who had good reason to murder her own husband (one husband was abusive, one a ""weakling"", one was vulgar and unappreciative, and one an animal hater), but who would want to kill all four? Or could the killer be the stuffy country club secretary, who wanted the four men banned from the club and was in love with one of the not-so-grieving widows? And how to get rid of the showgirl, who insists that Burke and Tim take care of her?