Oz Chambers lives in a haunted house. His mother wants to move, but Oz believes that the old place is too full of mystery to leave. When he and his friends hear ghostly footsteps, they decide to investigate the house's eerie reputation. But what Oz hasn't bargained for is that he's not alone in his quest and that solving Penwurt's puzzles will uncover a murky secret, and the chilling realisation that nothing is quite what it seems.The Obsidian Pebble is the first of five books in the Artefact series for young readers, age 9 and up.
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