SS-GB is an alternative history novel by Len Deighton, set in a United Kingdom conquered and occupied by Germany during the Second World War.

A naval officer, Rear Admiral Conolly Abel Smith, formed a British government-in-exile in Washington, DC but struggles to gain diplomatic recognition.

[7] In November 1941, nine months after a German invasion led to the British surrender, Douglas Archer is a detective-superintendent of London's Metropolitan Police Criminal Investigation Department at Scotland Yard who works on homicide crimes.

Since the case is linked to the German atomic program, Berlin dispatches SS Standartenführer Oskar Huth, who arrives to supervise the investigation.

Archer soon finds himself in the middle of a power struggle between Huth and Kellerman that is complicated by interservice rivalry between the SS, German Army, Gestapo and Abwehr.

Archer becomes romantically involved with an attractive American journalist, Barbara Barga, who is connected to the British Resistance leader Colonel George Mayhew.

Archer travels to the British prisoner-of-war camp that produced the prosthetic limbs and captures John, who signs a confession but claims that William's death was a suicide.

John then commits suicide with cyanide provided by an Abwehr officer Captain Hesse, who is under orders from his superiors to prevent him from divulging the German Army's atomic program to the rival SS.

Archer accompanies Hesse to a meeting with Mayhew and an Abwehr general, where he learns that the British Resistance and the German Army are conspiring to liberate King George VI from SS custody out of mutual interests.

Later, the British resistance bomb a "German-Soviet Friendship Week ceremony" to repatriate Karl Marx's remains from Highgate Cemetery.

With Mayhew's help, Archer and Woods manage to take the King to Bringle Sands to meet with a landing party of US Marines, led by Major Dodgson.

Prior to Huth's execution, Archer meets with him, who reveals that Mayhew used the King's rescue attempt as a diversion for US forces to attack Bringle Sands.

In November 2014, the BBC announced a five-episode miniseries, SS-GB, adapted from the novel by James Bond screenwriters Neal Purvis and Robert Wade.

Gavriel David Rosenfeld, a professor of history at Fairfield University, cited SS-GB in his book The World Hitler Never Made.