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...

It is an unusually warm spring and the snow is melting faster than usual. Scientists have come to the North Pole to study the changes. When Lars discovers the submarine, he also discovers two baby polar bears that the scientists have rescued from an ice floe. Lars promises to take the cubs back to their parents. But can he do it?

When two unlikely mice friends build a vessel capable of taking them to the bottom of the ocean, they go in search of a missing treasure, but find the truth to be far more amazing.