When Rainbow Fish gets lost and separated from his family and friends during an undersea storm, he makes new friends that help him find his way home.

"Mr. Fish feels nervous venturing deep in the sea to look for Ms. Clam's lost pearl until Miss Shimmer helps him conquer his fear of the dark." --

"Puffer Fish wakes up one morning to find that his pirate underwear has been taken from the clothesline! So Octopants the octopus offers to help look for them. They check Lobster's Laundry, look through Mermaid's hair, and even stop by Mussel's Fitness Club, but the underwear isn't anywhere...Then Shark appears and wants to join the group. But what's that on her head?"--

"Taking readers both big and small on an underwater adventure, Little Fish and friends introduce them to opposite words with the help of various sea creatures"--