In London, a shape charge-wielding master criminal comes up with a foolproof plan for robbing a bank and outwitting Scotland Yard's pursuit, but during the getaway he hides his haul in a radio set in the new flat of Capt. Bulldog Drummond (John Howard) and his to-be wife Phyllis Clavering (Heather Angel), leading to a murder, punch-ups, an expedition to France, a night in a French jail cell and a break-out, in a race to reach Bulldog's fiancee.
Phyllis is waiting for Drummond in a French village with her aunt Blanche Clavering (Elizabeth Patterson (actress)), to be married the next day. She has sent a telegram, asking him to send her the radio, both unaware of its content. The villains meet their end in a roof-top fight and Bulldog finally ties the matrimonial knot in an explosive finale to his bachelorhood.
John Howard as Captain Hugh Chesterton 'Bulldog' Drummond
Heather Angel as Phyllis Clavering
H.B. Warner as Col. J.A. Nielson
Reginald Denny as Algy Longworth
E.E. Clive as "Tenny" Tennison
Elizabeth Patterson as Aunt Blanche Clavering
Eduardo Ciannelli as Henri Armides
Gerald Hamer as Garvey (Armides' Henchman)
John Sutton as Inspector Tredennis
Neil Fitzgerald as Evan Barrows
Louis Mercier as Mayor Jean Philippe Napoleon Dupres