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Frank, Chase, and Griff were spending a late autumn afternoon overseeing a dozen Cub Scouts on a clean-up project when Chase came across an exciting discovery at the riverbank! Recent weeks with no rain lowered the level of the New Haven River, and this revealed something mysterious along the levee that had been hidden for more than fifty years!An antebellum mansion nearby became their focus as a strange box holding a cryptic message launched their search for its meaning. Add clues hidden inside an antique grandfather clock as well as discoveries from both sides of a sealed, rusty door, and the result is pure fun and mystery in a supremely satisfying adventure. The surprising outcome will keep you guessing until the final pages!Grab your flashlight, hop on your bicycle, and get ready for intrigue and twists in the fourth, exciting book of the Bon Air Boys Adventures Series!

A surprise visitor to Griff's home in the middle of the night launches the curious young detectives into a series of exciting escapades. Along the way, their homemade gadgets play critical roles as they gather clues and track down a thief. The story turns into a white knuckle dash through Perry Park with a desperate search and race against the clock high above Creek Canyon. This face-paced adventure will have you laughing one minute and holding on to your seat the next. As always, you won't want to put the book down until you reach the exciting and rewarding final pages.Grab your flashlight and hop on your bicycle as you join Griff, Frank, and Chase on a rollicking trip into the skies, down the side of a cliff, and across the white water of Creek Canyon. It's all here waiting for you!