 A jeweler in New York City is murdered after making a paste copy of the "Queen of Polynesia", a valuable and historic emerald about to be donated to the State of Hawaii. The 5-0 squad suspects that a switch might be planned at the unveiling ceremony. Jewel thief Janet Kingston, under the pseudonym Camilla Carver, and her sidekick Michael develop a scheme to get into the unveiling when Michael observes one of the invited guests, former Broadway star Thurman Elliott, stealing a diamond bracelet at a society party. Carver and Michael blackmail Elliott into taking her to the unveiling, set at the lovely Makaha Inn. When the "Queen of Polynesia" is brought out, Carver drops the Hawaiian girl wearing it with a poisoned rose, switches it for a paste copy, and then slips the real gem to Michael, posing as a waiter. McGarrett and the 5-0 team are immediately onto the scheme and seal the hotel. They interrogate Carver, and she tries to use Elliott s cute granddaughter Amanda to slip the emerald outside to Michael, now disguised as a cop. But Amanda struggles with him, attracting McGarrett s attention. McGarrett bring to fleeing Michael s car to a halt with a helicopter and the heist is foiled.