It's Derby day at Epsom downs, and the Sheridans are on the scene - Charles to take photographs, Kate to gather information for her latest novel. But the race becomes life-and-death when one of the jockeys doesn't make it to the finish line...

Meanwhile, Kate puzzles over the long-ago theft of an actress's jewels. But soon the Sheridans can't help wondering if the two strange events are, somehow, connected.