About This Book
A resourceful high-school girl and her friend turn a moonlight sail into an investigation after finding a floating bottle and seeing an unlit motorboat. Their sleuthing uncovers deliberate attacks on river craft, including dynamiting, a stolen boat, and the disappearance of a companion; suspicion falls on operators at a nearby boat dock. Nighttime pursuits, a blackout test, and searches of marsh flats and vacant buildings heighten the peril. Assisted by a reclusive riverhand and careful planning, they follow clues such as a message in a bottle and a skylight entry to locate the missing youth and expose the saboteurs.
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