England, 1922. "After their adventures at Westminster, Dora and Rex depart for a quiet month in the Cotswolds. Or at least, that’s what everyone thinks.
In truth, they’re working on a new assignment — investigating rumours that a titled foreigner might be more than he appears. Rex invites the man to his family manor for a rollicking weekend of fun. In between bouts of lawn tennis and parlour games, he and Dora are to uncover the truth about the man’s identity."