Due to an anonymous letter, Cody, Nick, and Murray reopen a case they had long since filed away and considered solved. Back then, a young surfer named Chris Miller lost his life. As their investigation progresses, the "Three from the Riptide" come across Billy Hagan, a singer who was successful in the sixties but now only lives off the glory of days long past. However, Billy is working on a comeback – and he's willing to go to great lengths to achieve it.
Cody, Nick, and Murray are tasked with escorting Renée, the stunningly attractive ex-wife of a notorious gangster, from Mexico to the U.S., where she plans to testify as a key witness in a trial. They eagerly accept this thrilling job – but their adrenaline soon spikes for entirely different reasons. Before long, they find themselves pursued by hitmen who take their mission just as seriously as the "Three from the Riptide."
The popular city councilman Harrison faces serious accusations: he is allegedly involved in computer tampering! However, all evidence points to the campaign against him being orchestrated by a police computer specialist. The "Three from the Riptide" are tasked with solving the case and discover that a gang is attempting to infiltrate the authorities with the help of an undercover operative. The friends quickly realize they are up against a true professional.
The detectives from the "Riptide" are working on a personal matter this time: their detective agency is on the verge of bankruptcy! Cody and Murray have decided to sell the business to a major competitor, but Nick is determined to prevent this at all costs. However, this is just the beginning – masked men break into the boat and search it. Shortly after, a friend of the trio, a security guard working for the competitor, is murdered. The friends must get to the bottom of the mystery.
The "Three from the Riptide" are faced with an unusual case this time: several biologists and a health policy official have died during the development of a new food additive. It appears they were exposed to a highly toxic substance while working. But was it truly an accident, or was it murder? Dr. Stockwood, the head of the research facility, is attempting to cover up the incident to avoid losing a multimillion-dollar contract.
Murray's former classmate, Brenda Malloy, has a big problem: the clever scientist developed a solar car and sold the design plans to the ruthless businessman Vince Drayger. However, the vehicle doesn’t work as expected, leaving Drayger feeling swindled. Before Murray can come to Brenda’s aid, she and her boyfriend are kidnapped by Drayger. Once again, the "Three from the Riptide" are called into action.
A modern Robin Hood keeps the "Three from the Riptide" busy: an ice cream vendor named Robin has taken his namesake as his great idol and aspires to be a benefactor to humanity. What he steals from the rich, he distributes to the needy and poor. Naive Robin doesn’t realize that part of his loot includes printing plates for banknotes – and it’s not long before gangsters of a much more dangerous caliber are on his trail.
An old friend of Nick's, Doug Skinner, has a taste for dangerous games and thrills. This leads him to an adventure involving human traffickers, where he tries to outsmart the gangsters. His solo effort puts him in grave danger, and the "Three from the Riptide" must step in to prevent the worst. With their help, they manage to deliver the criminals straight into the hands of the police.
Mysterious events unfold within the U.S. Army: Ben Wilkinson receives the devastating news that his son died during a military exercise. Nick accompanies the body on its transfer to Wyoming. However, the grieving father discovers that the body is not his son’s. When the "Riptide" trio begins to investigate, they encounter a wall of silence from the Army. What are they trying to hide from the three?
Fear grips King Harbour as a seemingly deranged serial killer has already claimed the lives of several victims. The targets are exclusively young women on the verge of marriage. The "Three from the Riptide" receive an important tip from an unexpected source: salesperson Robert Edwards suspects his tenant of committing the murders. And indeed, the detectives make a horrifying discovery in the woman’s apartment.
The niece of the late millionaire Gordon is convinced that her uncle was murdered and seeks the help of the "Three from the Riptide." The friends quickly grow suspicious when insurance agent Fenner obstructs their investigation. After Lieutenant Parisi also mentions Fenner’s uncooperative behavior, the trio devises a plan: they decide to go undercover and infiltrate the insurance company.
Special assignment for the "Three from the Riptide": Andrew Fitzsimmons Carlton III, a millionaire with a taste for eccentric ideas, is determined to reunite with a model he has fallen in love with. The detectives are tasked with tracking down the beautiful Danielle. What neither Carlton nor the sleuths realize is that the model is the daughter of a notorious mafia boss, Monty Paradise. Suddenly, the trio finds themselves caught in the crossfire of the "honorable society."
Frankie Kahana, a mediocre entertainer, is attacked and almost kidnapped. However, the "Three from the Riptide" happen to witness the assault and manage to prevent the abduction. They are completely baffled about the motives behind the crime, as Frankie’s lackluster shows hardly seem to be a reason. They soon discover that Frankie has a criminal past and is now apparently being targeted to silence him as an accomplice.
When Lucy, the owner of a laundromat, hosts her wedding, she also invites a relative from Beijing: historian Danny Lee. However, he seems to have vanished without a trace, prompting the "Riptide" trio to step in. As they begin their search, they quickly discover that the history professor is not as harmless as he seemed. In fact, he was an agent working for the United States – a role far from risk-free.
While searching for a mysterious pirate treasure, deep-sea diver Angelo Guirilini, a friend of Murray, and his expedition team are suddenly threatened by armed criminals. Investigations by the "Riptide" trio reveal that the gangsters are part of a weapons smuggling ring and feared Angelo might discover their underwater hideout. In a desperate move, they detonate a bomb, destroying Angelo’s research plans completely.
The "Three from the Riptide" are contacted by Hal Potter, the manager of a baseball club, who suspects that some players on his team are using drugs. But that's not all: as the detectives begin their investigation, an attempted murder is carried out against several team members. Among the players is Jason Young, a wealthy entrepreneur who, under a pseudonym, is pursuing his favorite hobby – baseball. It turns out the attack was actually aimed at him.
Murray originally just wanted to impress young FBI agent Gloria, so he convinced his friends to search for a missing Shakespeare document from the estate of a deceased professor. But, as usual, things take an unexpected turn: instead of the manuscript, the three discover that the professor was murdered. And because the detectives got a little too close to the truth, they soon find themselves in jail – under suspicion of murder!
A newspaper article about the "Three from the Riptide" portrays Nick as the leader of the trio – a claim that inevitably sparks disputes. After all, Cody and Murray don't want their contributions to go unnoticed. Lieutenant Parisi comes up with a Solomon-like solution: the three should hold a competition. Each takes on a case, and whoever solves theirs first is the winner. However, the cases turn out to be interconnected, making it impossible to determine a clear victor.
The "Three from the Riptide" are hired by businessman Langston to gather concrete evidence that he is being excluded from government contracts due to bribery. It’s a delicate task for the trio, especially since one of the corrupt officials is no stranger to them: Michael Todd, the fiancé of Joanna Parisi. The couple is about to get married – but now Joanna's future husband suddenly flees to Beijing.
This time, the "Three from the Riptide" hit the big leagues: they’re hired as consultants for a detective series being filmed in Hollywood. As part of the preparation, the show’s lead actors, Rosalind Grant and Cary Russell, essentially "apprentice" with the trio. Together, the detectives and the actors tackle a real-life mafia case to give the stars hands-on experience. However, the situation quickly proves to be highly dangerous.
A stranger approaches the "Three from the Riptide" and asks for their help: his son was recently released from prison, and he wants the trio to track him down. When they succeed and attempt to reunite father and son, the supposed father suddenly opens fire on the young man. In the ensuing shootout, the ex-convict is killed. To uncover more about him, the "Riptide" detectives head to Cypress Bay, a desolate provincial backwater.