Gwinny Tuffel is preparing for her first acting role in a decade in the West End,but she is dog-sitting on the side to keep the wolf from the door. So, whenageing rock star Crash Double needs help with his Border Collie, she jumps atthe chance. After all, looking after the charming Ace on Crash's Little Venicehouseboat shouldn't be an onerous task. But that's before the singer's deadbody surfaces during the annual Canal Carnival festivities.While the police dismiss the death as an accident, Gwinny suspects murdermost foul. With a medley of suspects and some far-fetched motives to makeheads or tails of, it is up to Gwinny, with Ace's on-the-ground know ledge, tomake sure the killer faces the music.