The Hardys purchase a Chinese junk named the Hai Hau to ferry passengers to Rocky Isle and make some extra money. Four mysterious men also are interested in the boat because of treasure hidden inside the Hai Hau. The Hai Hau is a stolen ship from Hong Kong. The other of the Hardys' friends, including Chet Morton and Sam Radley, also join the mystery. Their Chinese-American friend, Jim Foy, also lends a hand to them. George Ti-Ming is a private detective who helps his friend in Hong Kong find his missing ship. Chin Gok and Mr. Montrose are very interested in the junk because they think that the junk has treasure. Finally, the Hardys solve the mystery and share their rewards with their friends. Chin Gok, Mr. Montrose and the two phony Coast Guard members are caught by the Bayport Police Department Chief, Police Chief Collig.
Television adaptation
The book was adapted into a 1967 television pilot of the same name (it was not picked up), scripted by Richard Murphy and directed by Larry Peerce. Tim Matheson and Richard Gates (as Rick Gates) starred as Joe and Frank Hardy, respectively. Teri Garr played Susie, and Jan-Michael Vincent (as Mike Vincent) played Tony Prito.
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