Diarmuid Lawrence Director Tuppence Middleton Iris Carr Actor Selina Cadell Miss Froy Actor Keeley Hawes Mrs. Todhunter Actor Julian Rhind-Tutt Mr. Todhunter Actor Jesper Christensen The Doctor Actor Gemma Jones Rose Flood-Porter Actor Stephanie Cole Evelyn Flood-Porter Actor Tom Hughes Max Hare Actor Pip Torrens Reverend Barnes Actor Daisy Lewis Diana Actor Alex Jennings The Professor Actor Benedikte Hansen The Baroness Actor Emerald Fennell Odette Actor Sandy McDade Mrs. Barnes Actor Fiona Seres Screenwriter Anne Pivcevic Executive Producer Ann Tricklebank Producer David Head Film Editing Jill Trevellick Casting Susie Cullen Production Design Justin Warburton-Brown Art Director Zsuzsa Mihalek Set Decoration