Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle. Morgan le Fay will make Jack and Annie masters of the tree house if only they can solve four riddles -- which will take four books, of course! Dolphins at Daybreak begins the third set of four books in this magical (and increasingly popular) series! Jack and Annie are off in the Magic...

Seventh-grader Gabriel Nemo, the famous Captain Nemo's descendant, and his friends Peter and Misty save sinking ships, face mutant sea creatures, and more while eluding the Navy and Peter and Misty's parents.