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The clockwork key
Mabel and Will Greystone are on a mission to find the legendary lost town of Umber, famous for the invention of clockwork.
Working with their aunt Lucy, a famous relic hunter, they have to unravel the secrets of an ancient map, and the only other clue is a strange old key left behind by the last inhabitant of the town.
Also on the hunt for Umber is devious Byron Cogsworth, desperate for the glory such an important discovery will bring.
Can Mabel, Will and Aunt Lucy get there before him? And what secrets will the clockwork key unlock ...?
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