Aristocrat Julian Markham keeps his disfigured brother, Sir Edward, locked in a tower of his house. Occasionaly Sir Edward escapes and causes havoc around the town.
A gang of aspiring bank robbers involve themselves with arsonists and purchase their very own fire truck in an attempt to create the ultimate diversion. But posing as firemen leads them to disaster.
In World War II, the greatest threat to the British navy is the German battleship Tirpitz. While anchored in a Norwegian fjord, it is impossible to attack by conventional means, so a plan is hatched for a special commando unit to attack it, using midget submarines to plant underwater explosives.