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Are you up for a thrilling adventure?
After helping a scientist escape the clutches of enemy agents, the Mystery Kids are horrified when she removes her disguise and they discover her true identity.
Follow the children as they join forces with a spy, tunnel into a top secret laboratory, escape down a mine, flee a flash flood, hide in a ruined castle, and more!
This adventure novel is set in 1950’s Britain and will suit anyone who enjoys Nancy Drew, the Hardy Boys or the Famous Five.