Wealthy Rowland Sinclair, an artist with leftist friends and a free-wheeling lifestyle, reluctantly agrees to a charity race. He'll drive his beloved yellow Mercedes on the Maroubra Speedway, renamed the Killer Track for the lives it has claimed. His teammates are a young Errol Flynn and the well-known driver Joan Richmond. It's all good fun. But then people start to die...

The body of a journalist covering the race is found murdered in a House of Horrors. An English blueblood with Blackshirt affiliations dies in a Maroubra crash. Reporters stalk Rowly for dirt while bookmakers are after an edge. When someone takes a shot at him—it could be anyone. Then the police arrest one of Rowly's housemates for murder.