Bill Sinclair brings a rare statuette called the Manabi Figurine to Greg for safe keeping pending its appraisal, and hoped for a tidy profit on the archaeological find for himself and his partners. The figurine is stolen from Greg's safe and a murder is committed. Greg and Tom work with Lt. Quon to track down the killer and recover the figurine.
A crop of 20-dollar bills turns up in Honolulu, and the Treasury Department asks MacKenzie to help find the source. At first glance, the bills appear to be the work of former counterfeiter Capt. Joe, who they thought had gone straight. It turns out he has been kidnapped by the real counterfeiters, but is refusing to cooperate with them in making new $50 plates.
Tom Lopaka manages to talk an executive out of committing suicide by convincing the man that he will find the person who's been blackmailing him, but in order to accomplish this he must induce his old friend Greg MacKenzie to come to the islands to finger the bad guy. Greg is so taken with Hawaii that he decides to stay, and becomes a member of their detective agency.
Otto Von Helgren proposes to sail a raft across the Pacific Ocean ""in the interests of science"" - and a substantial grant from the Pacific Foundation. However, Abner Dexter, an officer from the Foundation, suspects a swindle when Von Helgren refuses to be photographed. Tracy is asked to investigate and calls on Rex Randolph of 77 Sunset Strip to help him expose the fraud.
Puppeteer Michael Dalli tells his asistant Sandra that he's replacing her with another girl. Then Sandra finds her look-alike puppet crushed. Distraught, she runs out into the streets and is run down by a car. Dalli's new assistant, Mona, then finds her puppet strangled, and Steele is called in to investigate.
The girl Harmon Kane is seeing is supposedly the daughter of a wealthy man, but in actuality the man posing as her father is an accomplice in a scheme to steal a valuable necklace called ""The Blue Goddess"". When the fake father buys the necklace with a bad check, Lopaka must track him down to recover the stolen goods.
Eight-year-old Patty Seldon has lost her boyfriend, Stevie. Cricket decides to have some fun with detectives Steele and Lopaka and introduces Patty as a client. The case becomes more interesting when a ring given to her by the young suitor turns out to be part of something stolen by the little boy's uncle.
Actor Mark Hamiton arrives in Hawaii and Tracy Steele draws an unusual assignment, to keep Hamilton's three ex-wives away from him. They plan to kidnap him in order to get back alimony payments. Hamilton also gets involved in a murder when he kills his business manager, who was aware that the actor had evaded paying his income tax.