Bernie Weinstock has a new assignment and a new business partner, Norman Lugg. A British soldier hid a large quantity of diamonds in Holland during World War II and he is tasked with discovering where they have been hidden.
As he continues his search for the diamonds, Bernie is unaware that he is being closely monitored by both Cyril Blackman, a shady underworld character and Inspector Dearlove of the CID.
Another member of Corporal Carter's platoon is the subject of scrutiny as Bernie becomes more embroiled in the mystery of the diamonds whereabouts.
The search for the diamonds has, inevitably, led Bernie and his team to Amsterdam where he is about to find more clues to their whereabouts.
The clues from Amsterdam have led Bernie to Germany and he feels he is close to finding Corporal Carter's horde of diamonds.
The mystery is about to resolved but will Bernie find the diamonds in the castle of General von Klauss and why has Inspector Dearlove not shown his hand yet? And will either of them be able to save Helen Carter who is being held prisoner by Cyril Blackman?