Holmes and Watson board a passenger train bound from London to Edinburgh, to guard the Star of Rhodesia, an enormous diamond worth a fortune belonging to an elderly woman of wealth; but within the first hour of the trip, the woman's son is murdered and the diamond stolen and any of the passengers in their car could be the killer thief.

A convicted thief in Dartmoor prison hides the location of the stolen Bank of England printing plates inside three music boxes. When the innocent purchasers of the boxes start to be murdered, Holmes and Watson investigate.

A fugitive receives help from a victim's sister as he tries to clear his name of robbery and murder charges.

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

When her husband is wrongly accused of murder, an opera singer sets out to find the real culprit.

The dream is unusually vivid: Bank employee Vince Grayson finds himself murdering a man in a sinister octagonal-shaped room lined with mirrors while a mysterious woman breaks into a safe. It is so vivid that Vince suspects it may have really happened. To get the dream off his mind, he goes on a picnic with some relatives. When a thunderstorm forces his party into a nearby mansion, Vince discovers that the bizarre room does exist, and it means nothing but trouble.

A gang of criminals, which includes a piano player and an imposing former convict known as 'Gruesome', has found out about a scientist's secret formula for a gas that temporarily paralyzes anyone who breathes it. When Gruesome accidentally inhales some of the gas and passes out, the police think he is dead and take him to the morgue, where he later revives and escapes. This puzzling incident attracts the interest of Dick Tracy, and when the criminals later use the gas to rob a bank, Tracy realizes that he must devote his entire attention to stopping them.

An estranged wife shows up after a nearly 7 years of disappearance -- thought to be dead, to prevent her husband from marrying his new love until someone kills her.

Pursued by the big-time gambler he robbed, John Muller assumes a new identity—with unfortunate results.

Young female models are being strangled. Will law enforcement be able to stop the crime wave before more women become victims?

A federal agent's life is in danger when he's exposed while investigating a parole scheme.

Secret Service agents make a deal with a counterfeiting inmate to be released on early parole if he will help them recover some bogus moneymaking plates, but he plans to double-cross them.

Roy Martin aka Roy Morgan is a burglar and former war-time Radio & Electronics Engineer who listens in to radio police calls, allowing him to stay one step ahead of the cops.

A dark night in war time, with several black-outs, it's just a night for murder. Susan Cooper, a fast-talking girl reporter, doubles as amateur sleuth solving yet another mystery among Hollywood's famous.

In the midst of World War II, Sherlock Holmes rescues the Swiss inventor of a new bomb-sight from the Gestapo and brings him to England, where he quickly falls into the clutches of the evil Professor Moriarty.

Frank Johnson, a sole witness to a gangland murder, goes into hiding and is trailed by Police Inspector Ferris, on the theory that Frank is trying to escape from possible retaliation. Frank's wife, Eleanor, suspects he is actually running away from their unsuccessful marriage. Aided by a newspaperman, Danny Leggett, Eleanor sets out to locate her husband. The killer is also looking for him, and keeps close tabs on Eleanor.

The police arrest a man climbing over the wall of a cemetery after midnight. He claims that he is being blackmailed and is following instructions he received by mail to leave $1000 on a certain grave. It turns out that he's not the only one who got a blackmail letter from the same person--calling himself "The Black Panther"--and it also turns out that all the recipients are connected to an opera company.

Blind detective Duncan Maclain gets mixed up with enemy agents and murder when he tries to help an old friend with a rebellious stepdaughter.

The city's District Attorney is murdered, and a newspaper reporter investigates. He starts finding out that everything wasn't quite as cut and dried as it appeared to be.

An investigator from the War Crimes Commission travels to Connecticut to find an infamous Nazi, who may be hiding out in a small town in the guise of a distinguished professor engaged to the Supreme Court Justice’s daughter.

A veteran homicide detective who has witnessed his socialite girlfriend kill her husband sees his inexperienced brother assigned to the case.

Vincent Lubeck is a vicious ex-convict. His criminal activities are despised by his family, but he uses and abuses them in the course of his crimes. Eventually his own brother must stand up to him.

A California railroad agent hunts two brothers for murder and robbing a payroll express.

In the middle of a pictorial lecture on his recent expedition to the Mongolian Desert, Dr. John Benton,the famous explorer, drinks from the water bottle on his lecture table, collapses and dies. His last words "Eternal Fire" are the only clue Chinese detective Jimmy Wong and Captain Street of the police department have to work on.

The town's leading citizen becomes a homicidal maniac after his wife deserts him.

A innocent dentist is murdered and the only apparent motive seems to be to steal a set of dental x-rays. To the police it looks like an accident, but private eye Brad Runyan thinks there's more to it.

A bedridden and gravely ill man believes his wife and doctor are conspiring to kill him, and outlines his suspicions in a letter.

An ex-American GI returns to Italy to find some money he stashed before doing a prison term. He discovers his cash is now gone and quickly sets off on a manhunt to find out who stole his buried fortune.

Circumstances force naive Rita Adams into serving an unjust prison term, but she emerges from it a cynical criminal who rises to power in the local crime organization.

A corrupt official at San Quentin tries to frame an innocent guard for several murders within the prison.