The Secrets of the Palace (Mermaid School, Bk. 4)

Get ready for a turtley awesome field trip with Lady Sealia Foam's Mermaid School!

Marnie Blue couldn't be more excited, because she and her class are going on a field trip to Queen Maretta's Palace. But when her mom gets sick and can't go on the trip, Aunt Christabel steps in. Miss Tangle in not happy about this because Christabel is o-fish-ially the biggest troublemaker that the school's ever known, and the trip gets off to a rocky start. Lucky for Marnie, she's in a group with some of her best friends, and Christabel gets her group of special VIM (Very Important Mermaids) tour that lets them go into the Jewel Room and even see the famous Ocean Orb of Truth! But when the Orb goes missing, can Marnie and her friends swim to the rescue and solve the case?