The books in this section are usually hardcover and in decent shape, though we'll sometimes offer hard-to-find books in lesser condition at a reduced price. Though we often put images of the book with their original dust jackets, the copies here won't always (or even often) have them. If that is important to you, please call ahead or say so in the order comments!
Another accident in Professor Bulfinch's laboratory, brought on by Danny, results in the creation of a transparent, resilient material. The material proves useful in creating a bathysphere, and Professor Bulfinch, along with his friend Dr. Grimes, Danny, Joe, and Irene, descends into the Pacific Ocean on an experimental voyage. Unfortunately, the bathysphere's pilot is rendered unconscious, and the bathysphere becomes trapped in a cave... Can Danny and his friends escape?
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