Twin brother and sister Ronan and Murel are true children of Petaybee, the sentient planet that is their home. Like their father, they are changelings, able to converse telepathically with creatures and to transform into seals. The Petaybeans wish to protect the twins from curious scientists, but no one realizes that Ronan and Murel hunger to discover the origins of their shape-shifting talent—and that their search for knowledge will place them in the path of peril. Meanwhile, Petaybee is changing. To investigate its sudden evolution, the twins’ father heads out to the open water in his seal form—and is presumed lost. Only Ronan and Murel, with their remarkable talents of transformation, can hope to find him and bring him home . . . if they dare to risk exposure and face the dangers of the newly unstable sea.
“The story is exciting and generously laced with humor, but besides those qualities, the characters . . . and their interactions are so well realized as to utterly charm readers.”—Booklist
While their leader, Kushtaka, is talking to them her son Jeel sees the sharks and goes to inspect them, Murel races after him but is too late and Jeel is killed. Meanwhile, Marmie and her crew are arrested on trumped up charges of kidnapping Ke-ola's family and taken to Gwinnett Incarceration Colony, along with most of the survivors they rescued. When Murel and Ronan return to their family and discover that Marmie has been arrested and the Piaf impounded they realize they need to get off the planet and go to her rescue. While staying with Kushtaka they were told that the deep sea otters were not just otters but beings from outer space who had hidden in the depths of Petaybee's oceans for years. Now that they have been discovered they plan to leave, the twins persuade Kushtaka to take them with her and to help them rescue Marmie.