Swing, brother, swing

Lord Pastern invited his society friends to a swank London nightclub to watch him stage one of his bizarre jokes. But when the joke turned in the "accidental" death of a band member, the laughter stopped. For the audience, it was an open-and-shut case. Everyone had seen the eccentric lord fire the gun. For Inspector Alleyn of Scotland Yard, this case was more bizarre than his lordship's joke - for it wasn't a bullet that killed the accordian player!