Lily James as Mieke de Jong

Jai Courtney as Capt Stefan Brandt

Eddie Marsan as Heinrich Himmler

Christopher Plummer as Kaiser Wilhelm II

Janet McTeer as Princess Hermine 'Hermo' Reuss of Greiz

Daisy Boulton as Secretary

Ben Daniels as Col Sigurd von Ilsemann

Stéphane Auberghen as Frau Linnenkamp

Aubeline Barbieux as Beatrix

Loïs van Wijk as Little Girl

Karin Leclercq as Widow in Hotel

Anton Lesser as General Falkenberg

Martin Swabey as Mueller

Martin Savage as Dirksen

Mark Dexter as Dietrich

Kurt Standaert as Schulz

Kris Cuppens as Pastor Hendricks

Frederik Lebeer as Signal Operative

Stéphanie Van Vyve as Hedwig Potthast

Lucas Tavernier as SS Colonel Meyer

Tom De Vreese as Wehrmacht Soldier - Brandt Unit

Luc Krijgsman as Wehrmacht Soldier - Brandt Unit

Verona Verbakel as Wehrmacht Secretary

Sebastiaan Ham as Wehrmacht Soldier - Brandt Unit

Sjoerd Schaap as Wehrmacht Soldier - Brandt Unit

Daan Aufenacker as Officer (uncredited)

Tom Magnus as Lieutenant Commander (uncredited)

Jan Smekens as SS Guard (uncredited)