SHADOWSEA takes Lily, Robert and Malkin on their biggest adventure yet, all the way to New York City and to the depths of the ocean, where secrets never stay submerged for long… Swept into the bright hustle and 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. Searching for clues, Robert and Lily are plunged into deep water… But will they uncover the deadly truth in time to survive?