WWII thriller in which a team of British experts are sent into Holland to secure valuable diamonds. It is May 1940 and the Nazi invasion of the Netherlands has begun. British Army Major Dillon (Tony Britton) heads into Holland with diamond experts Walter (Alexander Knox) and Jan (Peter Finch) on a mission to gather diamonds from Amsterdam dealers. Finding help from the suicidal Anna (Eva Bartok) along the way, the three must battle against time, mistrustful Dutch natives and the threat of German spies to secure their precious cargo.