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.
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.
Dave is temporarily reactivated into the military as a training officer. Intelligence has an enemy agent under surveillance and knows that her contact is in the unit Dave is training, but they don't know who the spy is. Dave must discover who the spy is to prevent his unit's ordered simulated attack on a nuclear power facility from becoming real.
A woman from South Carolina shows up at the office while Ken's trying to go fishing and asks him to find the boyfriend that jilted her. Initially reluctant, Ken takes the job and discovers that her ex-boyfriend has mob ties. Meanwhile, Daphne and Cha Cha attempt to improve her wardrobe in case Ken finds her boyfriend, and Lt. Plehn is trying to establish a case on a murdered mobster.
Sylvia, the head of a flourishing swimsuit company, walked off the job. Her husband hires Dave to find her, portraying her as mentally unstable and having made threats on his life. Dave finds Sylvia but she runs away rather than return to her business. When her husband turns up dead, Lt. Plehn seeks her arrest, ignoring the information Dave and Ken uncover about other possible suspects.
A famous TV star's plans for a gala program coinciding with his wedding anniversary face a potential shipwreck when his wife tells him she wants a divorce. He hires Dave to look after her, presenting her as a ""nervous"" type who might try suicide. Dave believes there is something more sinister behind her ""emotional"" problems, centered around her husband's ego and political aspirations.
A woman, the former girlfriend of a convicted mob boss, tells Lt. Plehn's brother, a star quarterback preparing to play in the Orange Bowl, that she is Lt. Plehn's mistress, and he stole evidence. Her boyfriend approaches the football star and tells him that, unless he throws the outcome of the Orange Bowl, the district attorney will be contacted and Lt. Plehn will be arrested. The charges aren't true, but the quarterback is so angry at his brother over the story that he refuses to talk to him. Sandy knows something is wrong after he sees Lt. Plehn's brother with a racketeer, but he has only one day before the big game to sort everything out.
When Ken inquires as to why his partner left the Boom Boom Room in an angry huff, Dave says he saw a man he wanted to kill. The man in question is Bernard ""Chilly"" Childress, a ruthless criminal whom Dave once unsuccessfully prosecuted in New York, and who was responsible for Dave once being shot in the chest. Lt. Plehn has word that Childress is planning on moving to Miami, so Dave sets out to do what he failed to do in New York: finish off Childress.
Dave is the focal point in the hunt for Dan Castle, Dave's one-time employer in a private investigative office in New York. People inquiring as to the man's whereabouts include a bounty hunter who is out for the $5,000 reward on Castle's head on a murder charge in New York and a woman who claims to be his wife. Dave tries to sort out who is telling the truth about his one-time co-worker before the bounty hunter makes Castle his sixth victim.
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.
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.