The plot has many unexpected twists and turns, and the reader never knows exactly what will happen next. The journey is fun from start to finish.
This book is outstanding.
Hal's little brother, Sammy, is like a clone of Bobby Belden from the Trixie Belden series. The kid is a brat who throws tantrums. He even threatens the older boys and then carries out his threats. All of the adults excuse Sammy's behavior and seem not to understand why the boys consider it a nuisance to babysit him. One adult says that the boys would "be the same way Sammy is if you didn't have any kids around your own age to play with." Oh, is that it?
I was skeptical about The Diamond Cave Mystery at first. I knew that the Power Boys book, The Mystery of the Million-Dollar Penny, borrowed plot content from this book. I did not enjoy the Power Boys book at all, so I had a negative feeling towards this book. Fortunately, the Power Boys book is a very poor imitation of this book. The Diamond Cave Mystery is outstanding.
Art and his younger sister, Liz, make a great team. Page 76 of the Harvey House edition has a great example of their teamwork.
"See!" he exclaimed, pointing triumphantly at the ground.This book has a really great mystery, and the reader is kept guessing as to how it will work out. This book is outstanding.
"Yes, look!" Liz cried excitedlybut she pointed at something different.
"The truck went this way," Art said. "You can tell by those tire treads I showed you a while ago."
"Who cares about tires? The important thing is that the burros went the same way. You can see their hoofprints," Liz answered.
Art grinned at the fact that he and his sister specialized in different kinds of evidence. But right now all the evidence pointed in one direction.