Jimmy Sutane is London?s favorite song-and-dance man, headlining at the Argosy Theatre, and beloved by all. Or almost all: Someone has taken to playing increasingly nasty pranks. Albert Campion offers to poke around, but what he finds chez Sutane nearly overwhelms him. The far-from traditional household features a clutch of explosive egos, including a brooding ?genius musician,? and a melodramatic young actress who seems to delight in drawing others into her web of carefully groomed tragedy. Someone here is aiming to hang up Sutane?s tap shoes on a permanent basis, and if Campion is to keep Jimmy dancing, he?ll have to come up with some pretty fancy footwork of his own.