While exploring near an abandoned oceanfront mansion, Katie, Sheila and Rusty stumble across a long-buried mystery and a present-day crime. Seeing themselves as amateur detectives, the three friends take on a case the local police department seems determined to ignore and in the process they put their own lives in the utmost danger. Spanning more than a century and covering a large chunk of history of Victoria, the conspiracy reaches from Spanish pirates to the highest levels of the present-day police department. Intertwined with bloodthirsty pirates, native legends, stolen Gold rush bullion and a lost diary, Katie, Sheila and Rusty uncover an international ring of art thieves and smugglers who are tied to the past in the most unexpected way. Discounted by the police and eager to solve the case on their own, the amateur detectives have their lives threatened several times; they must use all their resources to outwit the thieves.