Bill Bixby in the title role as a magician who comes to the aid of Kim Hunter, playing a middle-aged woman who becomes the target of an assassin because she's witnessed a murder. The magician uses his great talents to spirit her into hiding while he recklessly goes after the murder plotters.

After rehearsing for a benefit performance at the Los Angeles County Fair, Tony Blake spots a man being pummeled by two assailants. After rescueing him in his Corvette, Tony discovers that the victim, Albie Allikolos, is a horse breeder whose horse was recently crippled by an unknown attacker. Attending an outdoor party thrown by Albie that evening, Tony sees Albie shoot a creditor after a heated argument. Tony suspects a frame up, and, in attempting to vindicate Albie, uncovers an elaborate criminal horse racing scheme and finds his own life endangered.

A woman who begins laughing hysterically when her boyfriend Paul proposes to her falls down a staircase after he shakes her. Matt Matthews, a supposed friend, photographs Paul as he carries the body outside and convinces him that the police will never believe his version of what happened and that he should put the body into a trunk and dump it in the lake. Matthews then immediately proceeds to blackmail Paul. Tony Blake is involved when Paul's son, Danny, finds out what happens and attempts to help his father, only to be captured by the villains. Blake's investigation leads him to a rendezvous at an ornate, Gothic style inn where he must find his informant and outwit the blackmailers.

Magician Anthony Blake is setting up for a fund raising performance outside a church when a man, chased by two pursuers, stumbles onto the stage, trips over a piece of the rigging, and causes a scaffolding to collapse. The next scene finds Tony and the man, who he later finds out is named George, in a hospital room, Tony with a few bruises and George with amnesia. When the pursuers find George at the hospital, Tony rescues him and brings him to his friend, Max Pomeroy. Showing him a few pictures, Tony and Max are able to jog George's memory about an acquaintance, racecar driver Tim Dunnagin, whom George immediately runs out to see. Dunnagin reminds George that they were involved in a robbery 30 years earlier and that $1.6 million worth of loot is still hidden. Only George will be able to remember where it is--if he is able to get his memory back--but Dunnagin can be ruthless as well as impatient.