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.
Journeying up the Mississippi River with her father on a steamboat, Marie-Grace meets Wilhelmina Newman, and together they must unravel clues to a hidden Gold Rush treasure.
A collection of riddles, such as "When is a cook bad? When she beats an egg." and "What kind of coat should be put on when it is wet? A coat of paint.".