A man investigates the disappearance of two of his friends who were the guests of a sinister Austrian count.

Edinburgh, 1831. Among those who undertake the illegal trade of grave robbery is Gray, ostensibly a cab driver. Formerly a medical student convicted of grave robbery, Gray holds a grudge against Dr. MacFarlane who had escaped detection and punishment.

Suave amateur detective Tom Lawrence--aka Michael Arlen's literary hero The Falcon--arrives in Hollywood for some rest and relaxation, only to find himself involved in the murder of a movie actor. There's no shortage of suspects: the costume designer to whom he was married, a tyrannical director, a beautiful young French starlet, a Shakespeare-quoting producer, even a New York gangster. Helping The Falcon solve the crime is a cute, wise-cracking cab driver and a pair of bumbling cops.

The Falcon is framed for the murder of a banker and the theft of war bonds. He makes his escape into the mountains where he hides out in a rustic lodge. From here he uncovers a phony war bond operation.

In 1858 France, Emperor Louis Napoleon sends Captain Renault of the Royal Dragoons, Minister La Roche and Major Nicolet to Normandy in search of the members of a group of rebels. A Masked Cavalier, the niece, Lady Christianne, of the Marquis De Montableau, announces at a secret meeting of the Normandy underground leaders that the fabled treasure of Monte Cristo was willed to her and she will use it to finance their cause. Her uncle, the only one who can decipher the symbols on the sword of Monte Cristo, the key to the treasure, derides her stand against the Emperor. La Roche takes possession of the sword and has the Marquis put into the dungeon. Christianne, as the Masked Cavalier, regains the sword from La Roche, but Captain Renault apprehends her and returns to sword to La Roche.

The Falcon is called to a young woman's school to investigate a murder. When he arrives, another victim is discovered.

A society sleuth sets out on the trail of a society matron's lost jewels.

While on vacation, the Falcon is arrested for kidnapping after striking up a friendship with a girl whose nurse has been recently murdered.

A police detective uses his girlfriend to track down a homicidal maniac.

Oil heiress Mame Carson takes an incognito cruise so that men will love her for her body, not her money.