The creative team responsible for a recent Broadway flop (in which three chorus girls were murdered by the mysterious “Stage Door Slasher”) assemble for a backer’s audition of their new show at the Westchester estate of a wealthy “Angel.” The house is replete with sliding panels, secret passageways and a German maid who is apparently four different people — all of which figure diabolically in the comic mayhem which follows when the infamous “Slasher” makes his reappearance and strikes again — and again.