The once-notorious cabaret singer Adora Ferne guards a private treasure trove of twelve classic Jaguar cars, but hankers over the one that is missing. Enter Jack Colby: Adora's manager Danny Carter has commissioned him to buy the thirteenth dream car from its owner, the Earl of Storrington.

When a murder follows the earl's rejection of an offer, Jack is determined to find out whether there is a link between that and the twelve Jaguars. But the path to the killer divides: does the truth lie amongst the secrets of Adora's past or much closer to home? Speeding along the route he's certain will lead to the answer, Jack rushes headlong into danger.