The illustrations are cheerful and cute. The author plays with words in a fun way as he tells the story of two jellyfish brothers who are close as can be, until one is swept away by a “wave of superior magnitude.” Spencer tries to race to his brother’s rescue, but speed is not really a jellyfish’s strong suit. And so he calls upon his friends for help. With the help of a whale of superior magnitude, a mermaid, and a starfish, he locates his brother and figures how to lure him back out to sea before they both end up on the sand, and Horace once again helps the two find their way home. An author’s note in the back share additional information about jellyfish.