It is royal race day at Ascot, 1923. Lady Dorothea Dorchester, Dodo, has been invited by her childhood friend, Charlie, to an exclusive party in a private box with the added incentive of meeting the King and Queen.
Charlie appears to be interested in something more than friendship when a murder interferes with his plans. The victim is one of the guests from the box and Dodo cannot resist poking around. When Chief Inspector Blood of Scotland Yard is assigned to the case, sparks fly between them again. The chief inspector and Dodo have worked together on a case before and he welcomes her assistance with the prickly upper-class suspects. But where does this leave poor Charlie?
Dodo eagerly works on solving the murder which may have its roots in the distant past. Can she find the killer before they strike again?