First broadcast 16th August 2015.<br /><br />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. <br /><br />Danny Lee Wynter as Gilbert Worthing<br />Hannah Waddingham as Blonde Assassin<br />Jessica Raine as Tuppence Beresford<br />David Walliams as Tommy Beresford<br />James Fleet as Carter<br />Tam Williams as Harrison<br />Saffron Hocking as Teller<br />Trevor Cooper as Mr Harrison<br />Susan Brown as Mrs Harrison<br />Matthew Steer as Albert Pemberton<br />Joanna Horton as Barbara Kemp<br />Josh Cook as Dennis Harrison<br />Paul Cowling as Shopkeeper<br />David Moorst as Wilfred<br />Aoife McMahon as Sheila Perenna<br />Issy Van Randwyck as Mrs Minton<br />Robert Hands as Mr Minton<br />Pinar Ögün as Veronika Urbanowicz<br />Ed Speleers as Carl Denim<br />Christina Cole as Mrs Sprot<br />Roy Marsden as Commander Haydock<br />Alyy Khan as Major Khan
