Treasure From The Sea

On a holiday with her Nan who lives by the beach, Megan hopes to find a treasure left behind by the sea. But the treasure she finds is not what she expected.

When a dashing sea captain is rescued from death by a beautiful siren from the sea, he doesn't realize that she's actually a mermaid. Avenging fate drives them across the treacherous Caribbean, tossing them on surging tides of passion that transcend two worlds and bind their hearts with death-defying love.

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? Danny Dunn on the Ocean Floor is the fifth novel in the Danny Dunn series of juvenile science fiction/adventure books written by Raymond Abrashkin and Jay Williams.