Nick's help is sought by a man, whose wife's behavior changes every year on the anniversary of her first husband's death.

A mysterious German beauty uses Nick to get to Brian in the belief that he killed her mother.

Nick investigates the murder of a real estate developer's secretary. Nick (Jack Scalla) is hired to stop the psychological harassment ot a secretary by a petty crook, which looks easy until some big-time hoods "suggest" he back off. 

Nick is desperate for Brian's help after he is framed for murder. When fledgling private eye Nick Corsello is set up as a murder suspect by lovely but lethal jewel thief Tanya Marinakov he's driven to seek help from renowned ex-detective Brian Devlin — and to reveal his identity as the son Devlin never knew he had.

Brian and Nick try to find out who is poisoning the leading chefs of the world.

Brian inadvertently becomes involved in a "Maltese Falcon"-style murder mystery. Lady Buffy St. Clair has donated $ 1 million to the Cultural Center. Brian Devlin wants to thank her with a small gift. For this purpose, he is looking for a friendly jeweler. Moments later, Devlin is involved in a murder case ...

Nick's life is in danger when he meets and falls for a beautiful heiress. A young woman interrupts the funeral of a multimillionaire by claiming to be his illegitimate daughter.

Nick and Brian compete to capture a French criminal who is involved in a vintage wine scam and a plot to counterfeit franc notes, their paths lead to a dungeon in the villain's Napa Valley monastery. Brian Devlin poses as a monk as he and his private investigator son, Nick Corsello, investigate a big swindle involving fine wines.

Nick poses as a patient at an escape-proof mental hospital to find out how an eccentric genius managed to slip out and commit murder.

Brian fixes his son Nick up with his current girlfriend's younger sister for a day at the beach. Nick finds a dead body in the trunk of Brian's convertible. He must find a way to prove his father's innocence as well as investigate the murder.

Brian's secretary may be the next victim of a murderer who is stalking her condominium complex.

Brian and Nick track down the killer of a beautiful model who was involved with an underworld cocaine king.

When Nick Corsello is injected with a deadly virus, Brian Devlin has to give up his civilized world to search for the antidote.