Colin Firth → Ewen Montagu
Penelope Wilton → Hester Leggett
Kelly MacDonald → Jean Leslie
Jason Isaacs → admiraal John Godfrey
Rufus Wright → luitenant Bill Jewell
Matthew Macfadyen → Charels Cholmondeley
Ruby Bentall → Connie Bukes
Charlotte Hamblin → Patricia Trehearne
Johnny Flynn → Ian Fleming
Lorna MacFadyen → sergeant Roger Dearborn
Mark Gatiss → Ivor Montagu
Caspar Jennings → Jeremy Montagu
Hattie Morahan → Iris Montagu
Simon Russell Beale → Winston Churchill
Alex Jennings → John Masterman
Ellie Haddington → Hilda Georgina Chelmondeley
Mark Bonnar → Bentley Purchase
Nicholas Rowe → kapitein David Ainsworth
Will Keen → Salvador Gomez-Beare
James Fleet → Charles Fraser-Smith