Markham goes to France to help an artist determine whether the young girl who has come to be his model is his daughter who disappeared 19 years earlier.

Markham is assisted by singer Amy and pianist Andy Parker. Both are night-club entertainers, naturally Markham is hired to help Amy and her husband find out where the threatening notes come from. The question: Is Andy Parker just a piano-player or something more sinister?

A snowman with an ax in its hand is found on the doorstep of a Texas home in the middle of July.

An actress' husband is convinced his wife is responsible for turning their apartment into shambles.

Roy Markham meets another crisis with some timely action during a plane crash. Jeff Morrow is a diabetic who thinks his wife and friend Roy have left him to die without insulin after the disaster occurs. But Roy, having browsed through a medical journal one day, knows what to do.

Markham has another new one tonight, although you'd never know it if we didn't tell you. The plot is so old and the twists and turns so familiar, you'll insist you've seen it before. It does have the advantage of two pretty girls— Lupe and Elsie — both involved with a nightclub owner who turns up dead.

Pint-size newsboy Jimmy Standish carries a king-size grudge against his stepfather-to-be.

A blackmailer outwits Markham on top of a New York apartment house.

A best-selling novel pictures Markham as he is known by only one person---a dead man.

Markham's after the person who stole a sick child's dog.

Carla Zanalla is the femme fatale of an escort bureau in Rome who thinks Roy Markham can fit into her money-making scheme. Markham decides he must disguise himself as a dapper gigolo in order to discover the murderer of an old friend, Sam Roth.

A rash of murders seems to be the work of one man.

Markham may have trouble finding a vanished American tourist: he looks just like a deported gangster.

DA Jason Boon's daughter has been kidnaped to prevent his pursuing a case against a syndicate boss.

A British writer nominated for the Nobel Prize won't receive it---because he can't be found.

After witnessing a gangland "execution," a woman flees to Mexico.

A young rival challenges a veteran waterfront boss.

There's no mystery to Markham tonight. We see Jerry Clive strafing the nitro trucks, and pretty quickly Markham realizes that his old wartime buddy is the man responsible. The problem for Markham is to stop Clive, hold off a couple of predatory females and bring peace to our time.

Markham has a wild reunion with his fraternity brothers: one's planning suicide, another's planning murder.

Markham struggles against a fire in a cottage when he searches for a missing artist.

Markham learns the secrets of historic Barkley Manor and then shocks its residents.

When a house is deemed haunted, Markham is hired to evict the ghost.

Private investigator Markham goes aboard a Mediterranean steamer to track down the thief who stole a priceless ancient scroll from a Lebanese monastery.

A man goes berserk and kills his wife when he becomes suspicious of her meetings with his old friend Markham.

Roy Markham protects a lonely girl from becoming involved in a murder plot.

A wealthy couple fear that their daughter may try to kill herself.

On a train trip to Florida, Markham is confronted by a girl who claims her life is in danger.

Markham gets wounded by an assailant and the trail of the suspected gunman leads to a doctor and his nurse who is trying to protect her ex-convict husband.