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Meet Piotr, Minnie, Andrew, Flora and Sylvie - true friends and even better mystery-solvers! Flora and Sylvie are going on the holiday of a lifetime with their dad. But - WHAT? - Dad cancels the trip only hours before the flight because - OH MY GOODNESS - someone has stolen precious blueprints of Dad's latest invention- an amazing new scooter. But who? And why? Time to call on the only five people who can possibly solve the crime! The third in a fantastic new series filled with friendship, adventure and mystery! Perfect for fans of the Laura Marlin Mysteries by Lauren St John, this is THE new mystery adventure series by Waterstones Book Prize shortlisted author Elen Caldecott.