Plot

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.

During WW II, British commandos visit occupied Holland to keep a fortune in diamonds out of Nazi hands. Tense action follows as Anna, Jan and their colleagues play cat and mouse with the Dutch army, knowing that one of their number may be a traitor.—Mike Rogers <MICHAELPEM@aol.com>

English Army Maj. Dillon (Tony Britton) teams up with a diamonds experts Walter Keyser (Alexander Knox) and Jan Smit (Peter Finch) to contact all the diamond merchants in Amsterdam and recover their supplies of industrial diamonds in order to prevent the invading German army from capturing them. The trio is launched under cover into Holland as bombs drop nearby. After embarking at a harbor they find that the people of Holland are suspicious of one another after reports of German parachuters disguised as Dutch soldiers. Jan Smit stops a speeding car driven by a distraught Anna (Eva Bartok), who is suicidal because she inadvertantly contributed to the death of her fiance's parents. Piling into the car, they utilize Anna and her knowledge of Amsterdam to get them to the diamond merchants. Maj. Dillon is suspicious voicing his concern to others about Anna and her loyalty, as in this situation anyone could be a spy. There is no time to waste in meeting with the diamond merchants and emptying the bank vaults as it is estimated that Nazis will overrun the city in 24 hours. Some Dutch army units assist the Anna and the trio, but others try to kill them. At times Dutch army units shoot at each other. The three men succeed in getting the diamonds out, but Anna decides to stay.