As part of the latest scheme of a husband and wife con artist team the husband seeks to hire Ken, portraying his wife as cheating on him with the intended scam victim. Ken refuses to take the job because the man named is a friend and frequent client, but he becomes involved when a cohort of the couple turns up dead.
A drug store delivery boy borrows a formal jacket from Sandy for a prom. As he leaves the houseboat he is shot. Sandy thinks it was a case of mistaken identity and the bullets were meant for him.
Someone is trying to kill a former boxing champion, so his manager hires Ken to find out who is behind the ""accidents"" (including a bomb placed at SurfSide 6 during a party for the champ). Ken finds no shortage of suspects, including the boxer's ex-wife, a crusading sports writer, and a mob boss who owns the boxer's contract.
Jeff, a private investigator from L.A. and friend of the SurfSide detectives, is called to Miami to investigate a threatening note left for a lounge singer. He meets a redhead, who takes him to her home. He passes out and wakes up the prime suspect in the murder of the redhead's husband, leaving his SurfSide friends to clear him.
The small town of Green Bay doesn't like outsiders. One such outsider was acquitted of the murder of his father-in-law, although everyone still considers him guilty. Ken is hired by the man's wife to prove to the townsfolk that the man is indeed innocent.
A prince is developing a new co-op with oil. Sandy has been hired to ask the prince to consider a rival partner for the ""black sand"". With the amount of money at stake, rivals will stop at nothing to be the prince's partner.
A former client of Ken's is murdered in prison before he can be released to testify against a racket boss. In order to prove the boss was behind the murder, Ken must make everyone think the murdered man is still alive -- and that Ken and Dave have split up in an argument over the man's daughter.
An insurance company hires the boys to find the beneficiary of a life insurance policy named Nicole Johnson. Things get complicated when the boys find three Nicole Johnsons.
Singing sensation Tommy Minor has a problem -- gambling. His manager asks Sandy to get the mob off his back. Sandy knows a gambling boat outside the territorial limits runs crooked games, but he has to prove it, and keep himself and Tommy out of danger.
Daphne befriends five retired old crooks sharing a house together. A young crook is staying there and is stealing things and threatening everyone.
Sandy is hired to find an old acquaintance, the director of a lingere show. He encounters a number of romantic double-crosses. One member of the show entourage turns up dead, an apparent suicide, but Sandy thinks otherwise.
Not realizing that he is being taken by a conman, Garibaldi Dinato pays a year's rent up front to lease the Surfside 6 houseboat as a new location for his Italian restaurant.
A judge's daughter trips and falls on the beach near Ken, injuring her ankle. The ""accident"" leads to the two going out for dinner. What Ken doesn't know is the woman is being blackmailed by a racket boss to lure Ken into a trap where he will be accused of murder.
Jersey State, Dave's alma mater, is holding its class of 1951 reunion at the Fontainebleau Hotel. The reunion opens up old wounds that lead to murder.
Sandy is persuaded to help a ventriloquist whose dummy has been kidnapped.
While preparing to leave a tiny hotel Ken finds a young woman passed out in the hall outside his room. He revives her and discovers she is carrying $45,000 ransom money for her abducted boyfriend. Ken, against his better judgment, decides to help her ""negotiate"" with the kidnappers because she is $5,000 short of their ransom demand -- and she keeps fainting.
Dave Thorne runs into an old girlfriend who turns out to be involved in a marital triangle that leads to attempted murder.
Dave Thorne tries to defend Sandy, who is facing a murder charge after slugging a drunken attacker who was found dead only minutes later.
A wealthy businessman hires Ken to look after his wild daughter. The girl is enamored with an ex-con who owes a crime boss $25,000. When the man turns up dead, she confesses to his murder.
Daphne invites a friend of hers and her actor husband to a party on the houseboat. The couple argue and leave separately. He waits for Daphne's friend and kills her. Daphne strongly suspects this, but since Lt. Plehn and the SurfSide detectives refuse to listen to her theories she decides to take matters into her own hands.
When Daphne falls in love with a mysterious young nomad, the detectives are suspicious of his past.
When Daphne is kidnapped on the way to a friend's wedding in Nassau, Sandy discovers the truth about the prospective groom.
Surfside 6 was an ABC television series which aired from 1960 to 1962. The show centered on a Miami Beach detective agency set on a houseboat and featured Troy Donahue as Sandy Winfield II; Van Williams as Kenny Madison; and Lee Patterson as Dave Thorne. Diane McBain co-starred as socialite Daphne Dutton, whose yacht was berthed next to their houseboat. Margarita Sierra also had a supporting role as Cha Cha O'Brien, an entertainer who worked at The Boom Boom Room, a popular Miami Beach hangout at the Fontainebleau Hotel, directly across the street from Surfside 6. Surfside 6 was in fact a real address in Miami Beach, where an unrelated houseboat was moored at the time; it can also be seen in the sweeping aerial establishing shot of the Fontainebleu in 1964's Goldfinger.