double agents – Ashington is in fact RN Commander Blacklock, and "Fräulein Tiel" is Blacklock's wife, Jill. As Jill prepares to leave the island, Blacklock returns to the house to arrest Hardt, only to find he has eluded them. Disguised in Rev. Harris's clothes, Hardt manages to board the island ferry, which is also carrying Jill, a number of civilian passengers, and eight German POWs. Blacklock reports Hardt's escape to the base commander, who explains that the British had learned of the Germans' plan because the real Anne Burnett luckily survived the German agents' attempt to kill her by throwing her into the sea. At sea, Hardt manages to free the German prisoners and they seize the ferry. The Royal Navy pursue them, but before they can catch up, the ferry is intercepted by Hardt's submarine, and Hardt's first officer, Lieutenant Schuster (Marius Goring) decides to sink it. As the U-boat surfaces and prepares to fire, Hardt realises it is his own submarine. He frantically attempts to signal them, but too late – the U-boat shells the ferry, which begins to sink. By this time the British ships have arrived, and they drop depth charges, destroying the fleeing U-boat. As Jill, the other passengers and the crew abandon the sinking ferry, Hardt realises all is lost, and chooses to go down with the ship. Cast Conrad Veidt as Capt. Hardt Sebastian Shaw as Lt. Ashington/Cmdr. David Blacklock Valerie Hobson as Fräulein Tiel (schoolmistress)/Jill Blacklock Esma Cannon as Maggie. Marius Goring as Lt. Felix Schuster June Duprez as Miss Anne Burnett Athole Stewart as Rev. Hector Matthews Agnes Lauchlan as Mrs. Matthews Helen Haye as Mrs. Sedley Cyril Raymond as Rev. John Harris George Summers as Capt. Walter Ratter (ferry captain) Hay Petrie as James, the Ferry Engineer Grant Sutherland as Bob Bratt Robert Rendel as Admiral Mary Morris as Edwards, the Chauffeuse Margaret Moffatt as Kate Kenneth Warrington as Cmdr. Denis Torin Thatcher as Submarine officer Cast notes Bernard Miles has a small uncredited part as Hans, the hotel receptionist. Graham Stark has an uncredited part as a bellboy. Skelton Knaggs has a small uncredited part as the German sailor looking for Capt. Hardt. Production The Spy in Black was filmed at Denham Studios, with location shooting at Northchurch Common in Berkhamsted, Hertfordshire and in Orkney, Scotland. The film wrapped production on 24 December 1938 and was released in the