Paul is no longer aware of his diagnosis after a tobogganing accident brings on amnesia, so he returns to his fiancée Kate Pierce (Carol Lawrence) in San Francisco to help him with the mystery of six missing months in his life.

As prime suspect in the murder of his sailing companion, Paul is held on the island of Bonaire while the real murderer is exposed by an old friend as three people from the same Arkansas city meet there.

Paul goes to the aid of an old friend who's been arrested on a trumped-up morals charge, but finds that's only where the problems of Willy Hatch (Don Rickles) begin.

With just hours left Paul, who prosecuted the case six years earlier, tries to save Lou Patterson (Tom Skerritt) from the gas chamber.

When Paul falls hopelessly in love with novelist Nicole Longet (Claudine Longet), he flees, but she interprets his action to mean that he is a spy colleague of Mike Allen (Stephen McNally) until the agent reveals Paul's secret.

Paul's old friend Duke Smith (Sugar Ray Robinson) goes into a championship prize fight knowing he might collapse, so he places a bet against himself in Paul's name, leaving him to sort out the aftermath.

Paul experiences friendliness turning to malice when he is oppressed with demands from all sides after winning a fortune in the sweepstakes.

Paul's college friend Mark Shepard (Bobby Darin) gets him to help out in his tourist business on the Riviera, and they become involved with smugglers when they earn a sports car for assisting May Huston (Eve Arden) and her daughter Marcia (Davey Davison).

Paul tries to protect Diana Hays (Diana Hyland) from her eccentric husband Julian Hays (Jack Palance) who was convicted of her murder when she mysteriously disappeared.

Gigolo Ramon De Vega (Fernando Lamas) falls for fortune hunter Diana Murrow (Joan Hackett) at a posh Mexican resort.

Paul is flying to San Francisco to spend Christmas with his former fiancee, but gets stranded when his plane makes an emergency landing. And he ends up spending Christmas Eve with Harry Martin (Ernest Borgnine), a garrulous cabdriver estranged from his family and laughing his way through a lonely life.

Paul's old friend Clara Mallory (Jan Sterling), whose hands are disabled, becomes interested in the treatment of Belle Frazer (Kathryn Hays) by Dr. Raphael (Murray Hamilton) a supposed quack.

Traveling by bus across America Paul meets Tina (Kim Darby), a runaway teenager who alternately threatens him, then pleads with him to take her to Los Angeles.

As a favor to her father Paul searches the hippie enclaves of San Francisco and Los Angeles for Sara Prentice (Barbara Hershey), who writes erotic poems and charms all men.

When Paul makes a satirical toast behind the Iron Curtain, racing-car driver Janos Takacs (Eric Braeden) courteously joins in and finds himself in prison. Paul tries to make up for his frivolous action by freeing him with the help of his sister Marika Takacs (Gia Scala) and former prisoner Istvan Zabor (Telly Savalas).

Paul tries to solve the mystery of payments his friend Jim Carlson (Peter Greaves) is making that have led his wife Ellen (Delphi Lawrence) to turn to alcohol over fear of another woman.

A surprising encounter on the road brings Nicole Longet (Claudine Longet) back into Paul's life, complications in hers hindering their fragile attempts to let their love blossom again.

In Acapulco Paul meets a dare devil who seems to think he has nothing to lose when risking his life.

A casual relationship with Paul is taken too seriously by Valerie Phillips (Marianna Hill) and her industrialist father Cal Phillips (Ralph Bellamy) when the couple join a safari after two weeks together in Rome.

When April Martin (Carol Lynley) vanishes shortly after Paul meets her in New Orleans, he goes on a complex search that leads him to a surprising solution to the mystery of her disappearance and a threat to her life.

In Mexico, Paul vies with charmer and con man Ramon de Vega (Fernando Lamas) for the affections of the wealthy Jessica Braden (Tippi Hedren).

An old friend of Paul's is on the run, suspected of murdering his lover's husband, and Paul returns to his home town to investigate the case.

Stranded in the middle of nowhere, Paul hops a freight and becomes companion of the enigmatic Brett (Robert Drivas) on a trek full of symbolism.

In Monte Carlo Paul has to come to the rescue of gigolo Ramon de Vega (Fernando Lamas) when “sparrow” Charlotte Hyde (Gena Rowlands) doesn't turn out as he bargained.

Paul is romancing a princess on the lavish yacht of his friend Rachel Pike (Vera Miles) when pal Ramon de Vega (Fernando Lamas) inveigles him into arranging an introduction to the financier, but Rachel is too much of a match for the gigolo.