First broadcast 16th August 2015.
Major Carter commandeers Tommy for a mission he must keep completely secret, even from Tuppence. There is a leak on the Third Floor and Tommy is the only man Carter can trust.
Danny Lee Wynter as Gilbert Worthing
Hannah Waddingham as Blonde Assassin
Jessica Raine as Tuppence Beresford
David Walliams as Tommy Beresford
James Fleet as Carter
Tam Williams as Harrison
Saffron Hocking as Teller
Trevor Cooper as Mr Harrison
Susan Brown as Mrs Harrison
Matthew Steer as Albert Pemberton
Joanna Horton as Barbara Kemp
Josh Cook as Dennis Harrison
Paul Cowling as Shopkeeper
David Moorst as Wilfred
Aoife McMahon as Sheila Perenna
Issy Van Randwyck as Mrs Minton
Robert Hands as Mr Minton
Pinar Ögün as Veronika Urbanowicz
Ed Speleers as Carl Denim
Christina Cole as Mrs Sprot
Roy Marsden as Commander Haydock
Alyy Khan as Major Khan
