Great Hardy Boys book! I enjoyed the action and mystery. Loved that Frank and his girl Callie, Joe and his girl Iola were in the book. Great seeing Phil Cohen, and their friend from the Bayport PD, Con Riley helping out as well. I've read it twice now and loved it both times. I read it first a couple of years ago when it was released digitally as an ebook. There is plenty of good investigating, danger, and excitement. Several edge-of-your-seat scenes. I love the Hardy brothers and this is an excellent read.