This is a feature-length compilation of three short episodes taken from a TV series called 'Colonel March of Scotland Yard' (1954-56, 26 episodes) starring Boris Karloff as Colonel March, head of Scotland Yard's Department D.3, otherwise known as The Bureau of Queer Complaints.

Several murders of nuclear scientists, that baffles Scotland Yard, occur in London around the same time that Bill Locklin, a special officer from the United States State Department, arrives to oversee the transfer of Professor Leon Dushenko, a Russian scientist who has fled the USSR. An attempt on Dushenko's life is made with a monkey's paw-print found at the scene.

Charters and Caldicott are touring the Middle East. After visiting Saudi Arabia they find themselves in Bagdad where they are mistaken by a group of German spies for the messengers who are to carry a song record by beautiful singer La Palermo which contains secret instructions of the German Intelligence. Realizing their error, the German spies follow Charters and Caldicott to Istanbul and Budapest, trying to eliminate them and retrieve the record.

An archetypal Englishman returns from a jaunt abroad to face a dastardly foreign count in a screwball duel for the hand of a beautiful mademoiselle.

Mediterranean ferryboat captain Henry St James has things well organized - a loving and very English wife Maud in Gibraltar, and the loving if rather more hot-blooded Mistress, Nita in Tangiers. A perfect life. As long as neither woman decides to follow him to the other port.

A British Sanitary Engineer, goes on holiday with a set of plans for a new secret weapon which he has mistaken for his new plumbing invention. Everyone is hunting for him, including the Russians. The Russians find him and offer him a job in the Kremlin doing research (on plumbing he believes). He accepts, arrives in Russia and falls in love with Tania, a secret agent. And then discovers the true nature of the plans he is carrying...

A jewel thief finds himself a target when a smuggled cigarette case made from a stolen new metal falls into his hands.

Those who have interfered with the Tomb of Ra-Antef are in terrible danger. Against expert advice, American showman and financial backer of the expedition, Alexander King, plans a world tour exhibiting this magnificent discovery from the ancient world but on the opening night the sarcophagus is void of its contents. The mummy has escaped to fulfill the dreadful prophesy and exact a violent and bloody revenge on all those who defiled his final resting place.

Injured and on his deathbed in Greece, Lord Byron imagines a celestial trial with witnesses to determine the worth of his character.

A young employee of the British State Department falls in love with the daughter of a top Russian diplomat, much to the panic of their respective countries' officials, who suspect espionage. The cast includes David Knight, Odile Versois, Theodore Bikel and David Kossoff.