Peter and the Shadow Thieves by Dave Barry and Ridley Pearson

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 In this riveting and adventure-packed follow-up to the award-winning New York Times bestseller Peter and the Starcatchers, Peter leaves the relative safety of Mollusk Island - along with his trusted companion, Tinker Bell - for the cold, damp, dangerous streets of London. On a difficult journey across the sea, he and Tink discover the dark and deadly slithering part-man/part-creature Lord Ombra, who is intent on recovering the missing starstuff - celestial dust that contains unimagined powers. In London, Peter attempts to track down the indomitable Molly, hoping that together they can combat Ombra`s determined forces. But London is not Mollusk Island; Peter is not the boy he used to be; and Lord Ombra - the Shadow Master - is unlike anything Peter, or the world, has ever seen.
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