It\"s hard to escape the secrets from the past. Storm clouds gather over Lily and Robert\"s summer when criminal mastermind the Jack of Diamonds appears. For Jack is searching for the mysterious Moonlocket - but that\"s not the only thing he wants. Suddenly, dark secrets from Robert\"s past plunge him into danger....

Dark secrets never stay submerged for long. Swept into the bright hustle-bustle of New York, Lily, Robert and Malkin discover that danger lies beneath the city\"s surface. For there are chilling goings-on... A strange boy held captive who needs their help, and a shadowy professor with a treacherous plan....