When Germany invades Holland in 1940, a British intelligence officer and two Dutch diamond merchants go to Amsterdam to persuade the Dutch diamond merchants to evacuate their diamond supplies to England.

In wartime, a young officer is killed during a raid to kill a German general at the house that used to belong to his grandmother. Before he dies he talks about a treasure that was hidden there. Several years later, the members of that group are still together as a street band living in a cellar. The last of the gang, who was chosen for his skills as a ruthless killer, escapes from prison in a rampage of killing and, obsessed with the treasure, takes the gang to France to recover it.

Greedy sailors capture a giant lizard off the coast of Ireland and sell it to a London circus. Then its mother shows up.