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Are you up for a thrilling adventure?While camping in Wales, it doesn't take long for the Mystery Kids to stumble across a long-lost tunnel that leads to a valley full of secrets.Follow the children as they are imprisoned in an old farmhouse, discover a hidden cave, sabotage a plane, rescue a missing man, undertake a perilous climb, and more!Book 3 in the Mystery Series, this adventure novel is set in 1950's Britain and will suit anyone who enjoys Nancy Drew, the Hardy Boys or the Famous Five.