The French owner of an antique shop, Desius Heiss, (Oskar Homolka) has become disillusioned with society since his torture as a prisoner on Devil's Island, since when he has allowed his shop to become a front for criminal activity, and he himself is a receiver of stolen goods.
The famous detective and his trusty side-kick, Tinker, are called in by the War Office to find some important papers that were stolen from a man killed during an air raid.
George is an unwilling civilian during the war. When an enlisted friend switches clothes with him in order to go to a party, George finds himself mistakenly pressed into the navy, where he gets involved with pretty Ann Firth and caught up in a subplot involving German spies.
Eccentric Cambridge archaeologist Horatio Smith takes a group of British and American archaeology students to pre-war Nazi Germany to help in his excavations. His research is supported by the Nazis, since he professes to be looking for evidence of the Aryan origins of German civilisation. However, he has a secret agenda: to free inmates of the concentration camps.
Will Hay, back in his role as a hapless teacher, is hired by a grim school in remotest Scotland. The school soon starts to be haunted by a legendary ghost, whose spectral bagpipes signal the death of one of the staff. Hay, assisted by Claude Hulbert and Charles Hawtrey, has to unravel the mystery before he becomes the next victim.
Old Bill has grumbled his way through the trenches of the First World War. Now it is the Second and, envious of his son, Young Bill, he decides to enlist. He finally enters the Pioneer Corps, which is based near his son. When Young Bill goes missing during a raid, Old Bill shows that there's still life in the old dog yet!
Hitler's doctor is gradually realising that the Nazi regime isn't as good as it pretends to be when his friends start to "disappear" into the camps. His wife is courted by the party and accepts a political post in Berlin. Meanwhile Dr Karl decides to try to do something to counteract the Nazi propaganda and with the help of an engineer and a few friends he sets up the Freedom Radio to counteract the Nazi propaganda.
It's war time London and the Crazy Gang (Flanagan & Allen, Nervo & Knox, Naughton & Gold) are doing their bit for the war effort by running a fish and chip stall using their platoon's barrage balloon for advertising. Their Sgt Major is not happy about this and orders them to take the balloon down, but a freak heavy wind accidentally carries the gang away to Nazi Germany. They are captured and placed in a detention camp where they meet an elderly prisoner named Jerry, who possess a map for the location of a secret weapon which will win the war! Fortunately Teddy Knox's impersonation of Hitler lands him the spot of pretending to be the Fuhrer at a gala dinner and the gang are allowed out of the camp. However the Nazis have other ideas for their substitute leader.
The village of Altdorf has to come to terms with Chancellor Hitler and the arrival of a platoon of Stormtroopers. The Stormtroopers go about teaching and enforcing "The New Order", but Pastor Hall, a kind and gentle man, won't be cowed. Some villagers join the Nazi party avidly, and some just go along with things, hoping for a quiet life, but Pastor Hall takes his convictions to the pulpit.
When a neutral Danish merchant ship is forced to put into port after trying to evade British wartime contraband control, its captain becomes involved in a beautiful British Naval Intelligent agent's efforts to capture a group of German spies operating from a London cinema.
The Four Men of the title are British WWI veterans who decide to work secretly against enemies of the country. They aren't above a bit of murder or sabotage to serve their ends, but they consider themselves to be true patriots.
When a wealthy, lonely university music student is beaten and has his apartment trashed by a fellow dorm resident-bully and his gang, he goes mad, lures the bully into his room on pretense of forgiveness, slips him a paralyzing agent in a drink, throws him in a trunk and locks him in, and taunts the bully with the promise that he will be buried alive in the trunk. Only, once he gets his trunk and his prey to his country estate, the vengeful victim finds things keep going wrong...