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Sophie and Josh are spending the summer in San Francisco while their archaeologist parents are off on a dig. Sophie is working in a coffee shop and Josh has a job in the bookshop opposite. Things are jogging along nicely. Until, that is, Dr John Dee and his mud-man golems appear and steal a book from Nick Fleming, Josh's employer. Nick, it appears, has been hiding his true identity. He is none other than the fourteenth century alchemist Nicholas Flamel, the man who discovered the secret of turning base metal into gold and the recipe for the elixir of eternal life. The book stolen by Dr John Dee is none other than the Book of Abraham, the Codex which contains all the alchemist's secrets and more besides. Josh and Sophie's presence is no accident either - they are the twins of ancient prophecy with magical auras of pure silver and gold. If anyone can prevent Dr John Dee from summoning the Dark Elders to destroy mankind, it is them. And so, the race is on.