Michael Leeds' world premiere of Who Killed Joan Crawford? at Island City Stage was an amusing respite from a season dominated by works of political and social provocation. Predicated on the durable stereotype (or just flat-out reality) that gay men love Joan Crawford, Leeds' comedic murder mystery is built on an ingenious conceit: a birthday gathering of Crawford devotees who are required to show up dressed as a favorite Joan role. When one of the Joans is found in a closet, hung in more ways than one, it sets off a chain of mysterious deaths, forcing the others to suspect the obvious: One of these men, clad in the frocks of '40s femmes fatale and crazed, eyebrow-arching matriarchs, is a killer. Spiked with the inside-showbiz humor at which Leeds excels — on top of everything, it's the night of the Tony awards, whose importance is just as paramount for some of the Joans as fingering the serial killer in their midst — Who Killed Joan Crawford? proved equally adept at surprising us. And at a lean 75 minutes, it didn't overstay its campy welcome.