The Rivals of Sherlock Holmes - Season 2 (1973)

The mysterious Mr. Laxworthy hires two ex-cons for a job in the south of France. But the self-described "adventurer" isn't after money. His eyes are on greater prizes--the most valuable secret of the French navy and the reputation of two very important men.

Amateur detective Eugene Valmont begins by investigating a counterfeiting operation--and ends up uncovering an even more ingenious swindling scheme. But he may have met his match in one particular adversary.

The dangers of revolutionary Russia come to quiet Copenhagen when a countess from St. Petersburg flees to the Danish capital, claiming her anarchist brother-in-law is trying to kill her. The case falls to local cop Lt. Holst, who struggles to make sense of it all.

Asked to perform an unnecessary amputation, a London surgeon calls on his colleague, Prof. Van Dusen, to learn the reason for the gruesome request. Van Dusen's investigation leads him to a country house; a mad, shotgun-toting aristocrat; and an incident three years earlier.

A recently married Habsburg countess hires dashing private detective Dagobert Trostler to find out who has been sending her obscene letters. The writer clearly knows her most intimate secrets, as well as those of a friend who is likewise receiving compromising letters.

Coming to the aid of a man kicked by a rearing police horse, Dr. John Thorndyke stumbles upon an anarchist plot to assassinate a visiting Russian grand duke. The key appears to be a cryptogram written in ancient Moabite found on the man's body.

When two European spies join a hunting party at an English country house, William Drew of the Foreign Office goes undercover to pursue his own type of prey. Drew suspects a traitor may be working with the spies, and soon learns they are more than willing to kill to get what they want.

Two leading London barristers--Queen's Counsels--disappear during a murder trial, one for the prosecution and one for the defense. Junior defense barrister Charles Dallas searches for his two colleagues, but they are about to undergo the most bizarre of trials themselves.

When a fortune in gold bullion disappears from the strongroom of R.M.S Oceanic, a ship which is trying to establish a new record time for crossing the Atlantic, the ship's purser, amateur detective Mr Horrocks, investigates.

After the strangulation of a rich widow, her necklace turns up in a pawnshop run by a young gypsy woman named Hagar. The police quickly zero in on a chief suspect, but Hagar has other ideas about the culprit. However, sometimes even her instincts can let her down.