The series was loosely based upon the literary character Matt Helm, who had been created and introduced by Donald Hamilton in his 1960 novel, Death of a Citizen. The concept of the series sees Matt Helm, a retired spy, opening a private detective business.
Helm sets out to find an air freight company executive who disappeared after deciding to terminate his involvement with a drug smuggling ring.
Helm is hired by a charming socialite with a dual personality to investigate a murder that she may have been committed while acting as her other self.
After the lawyer who was helping her find her natural parents is murdered, an adopted woman turns to Helm for help.
Helm investigates the death of a tycoon who was going to be a player in the highest stakes poker game of all time.
Helm agrees to help an old friend find his business partners, unaware that they had been involved in diamond smuggling.
An old associate of Helm's becomes a hit man's target for no apparent reason.
Helm investigates the kidnapping of a prized stud horse and the murders of the three men who had been watching the horse.
Helm discovers a seriously wounded woman on the beach, only to find her gone when he returns with help.
After clearing a businessman of murder charges, Helm discovers some new evidence that points to the man's guilt.
Matt investigates the death of a research scientist who was found frozen to death after an apparent skiing accident.
While searching for a woman who was involved with a $250,000 robbery, Helm finds himself being trailed by her cohorts who are hoping he will lead them to the loot.
Record pirates murder a detective friend of Helm's who had been hired to investigate possible piracy by a suspicious musician.