A journalist gets pulled into an intrigue by his editor that involves a story that he received a Pulitzer for years before. It seems that the second largest diamond ever mined was used during World War II to buy a Jewish woman freedom from a prison camp. Only trouble is it disappeared after the war and now everyone is after it, including the Russians, former Nazis, gangsters, and the original owner. Somehow, the story that the journalist originally wrote about a camp survivor is believed to have leads to the diamond.

Paul Gregory (William Sylvester) is an accomplished composer despite his blindness, and his beautiful wife Anne (Barbara Shelley) seems to be the perfect supporting wife. But unknown to Paul, she is having a passionate affair with Ricky (Alexander Davion), a struggling artist. Keen to support her artist lover and give them more time to make love, she persuades Paul to commission Ricky to paint her portrait. But Paul senses their affection for each other, and threatens to cut Anne off without a penny. Desperate to keep both her lover and Paul s money, Anne plots the perfect murder and asks Ricky to carry it out...

Veteran Detective Ed Delopre and partner Mike McGivern have their hands full when they hit the pavement in search of a dangerous killer with five dead bodies already on his record. The mayor, in a rush to see peace restored in her city, makes a deal with the mob instead of waiting for Delopre and McGivern's results. Now that both sides of the law are involved in the killer's capture, the city is turned upside down.

A war drama of motor torpedo boats which did much unsung work in WW2, but the naval battles merely provide an exciting story in which an even more special romantic drama is wrapped up.