While perusing the books of an engineering company, fastidious auditor Frank Manning encounters rum goings on when he is approached by a woman who claiming she is being blackmailed. She begs him to find certain letters and he eventually agrees. Having obtained the letters, he takes them to a specified address where, to his horror, he finds a man, fully clothed, dead in the bath.

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.

An eccentric jewel-thief invites an assortment of people for a country house week-end, then keeps them prisoner after his plans to steal their jewels have been discovered.

A German submarine is sent to the Orkney Isles in 1917 to sink the British fleet.