[1] The partners investigate mysteries and protect clients with the sometime help of photographer Cricket Blake (Connie Stevens), who also sings at the hotel's Shell Bar, and a ukulele-playing cab driver Kim Quisado (Poncie Ponce), who has "relatives" throughout the islands.
Engineer turned detective Greg McKenzie (Grant Williams), joins the agency later on as a full partner, while hotel social director Philip Barton (Troy Donahue) lends a hand after Tracy Steele departs.
Although raised by beach boy Fiji (Robert Warwick), Petero (Troy Donahue) has distant memories that convince him the wealthy Donna Lane (Anna Lee) is his mother.
During the 1950-53 Korean War, Tracy Steele served with Harry Gulliver (Adam Williams), who was put on trial for an act of cowardice endangering American military.
Tracy is now hired by a Los Angeles law firm to find Gulliver's fiancee Nancy Campbell (Suzanne Storrs).
Her no-show for her regular Shell Bar performance, makes Tom Lopaka launch an investigation When Julia Abbott (Kathleen Crowley) returns to the islands to liquidate her father's estate, she sells his decades-old limousine, equipped with bullet-proof glass, to Kim who uses it for his taxi service.
With cooperation from her companion Zara Latif (Paula Raymond), Crown Princess Suvi (Lisa Gaye) deliberately disappears with her presumed boyfriend Victor Soriano (Nico Minardos) during a stopover at the Honolulu Airport.
Tom Lopaka investigates a bribery charge against assistant prosecutor Jim Kuno (Paul Mantee), brought on by local man Roy Briggs (Don "Red" Barry).
Alleged victim Patricia Melford (Lillian Bronson) talks to Lopaka, who is convinced her story doesn't add up, and runs a trace on her background.
Lt. Danny Quon (Mel Prestidge) knew the deceased well, doesn't believe the coroner's findings, and hires MacKenzie to investigate.
Cricket Blake goes under cover in brownface, masquerading as a local island woman to ferret out a smuggling ring, after her friend Kina Nalu (Tita Marsell) is murdered.
Lead actor Norman Ayres (Bill Williams) and actress Sue Alden (Joan Staley) are driven from the airport by Poncie Ponce.
Sue's real life boyfriend Mark Hollis (Ed Nelson) lands a part in the movie, making her nervous.
Kookie (Edd Byrnes) at 77 Sunset Strip in Los Angeles investigates for Tracy and finds Chuck hiding at a motel in California.
During a tropical storm, Greg and a group of tourists are stuck inside the mansion of Eunice Chalfrey (Isobel Elsom) and Felicia Fairweather (Hope Sansberry).
A threatening note is found, and everyone speculates who wrote it, and who is it aimed at, until Clara Brill (Constance Davis) is the guest who is murdered.
Business woman Koko Kate (Virginia Gregg) is looking forward to the homecoming of her son Chris Randall (Chad Everett).
Married tennis pro Joe Richards (Fred Beir) helped raise her up out of obscurity, only to be coldly discarded as she moved to the next man.
Judson Kirk (Simon Scott) has received discouraging news from his doctor, and before he dies, wants to reconcile his relationship with his estranged son Peter (Joseph Gallison).
Norma (Dianne Foster) and Arnold Marriott (Andrew Duggan) plan to build a house on native Hawaiian sacred ground.
Tom Lopaka, undercover as Surfer Sam, taxi driver Kazuo Kim, and mystery writer Charlene Boggs (Diane McBain) investigate a suicide at a Kauai resort hotel.
Miles and Mary Ann Abbott (Lisa Gaye) intend to marry, but she must first divorce her husband Duane (John Archer).
When the two men embark on a wild boar hunt, Phil travels to Kauai accompanied by Continental Insurance investigator Van Stewart (Mark Dempsey).
Don Munroe (Van Williams) and Grady Howells (Fred Holliday) kidnap Tom Lopaka, injecting him with sodium pentothal, or truth serum, in order to learn about the route of the armored car carrying two million dollars in cash: a route which only Tom, Greg MacKenzie, and Moke (Douglas Mossman) were supposed to know about.
The police and the Hawaiian Eye private investigators track down Don and Grady at the airport, planning to flee with the money to the mainland.
Philip Barton and Cricket uncover a long line of scam investigations about the Weirs that Brother Love was not aware of, and is subsequently shot by Mitchell.