Book 1

“[A] solid start of a new series . . . fast-paced adventure.”—Publishers Weekly

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

Book 2

Maelstrom

by Anne McCaffrey and Elizabeth Ann Scarborough

Published 1 January 2006
The Shongili twins, Ronan and Murel, accompany their friend Marmie on her luxury space craft Piaf to rescue their friend Ke-ola's family from an uninhabitable planet. They arrive to find the planet in the midst of a terrible meteor storm and when they go down to the surface find that the survivors have taken refuge under ground. Ronan and Murel change into seal form and find the survivors and their totem animals or aumakua, the giant turtles, or Honu, and the sharks. Back on Petaybee the twins, in their seal form, escort the Honus to their new home in the middle of the ocean. They also want to warn the otters and seals about the sharks. It is a long journey and Murel falls asleep and gets separated from the rest. She is surrounded by a pod of Orcas who, thinking she is a normal seal, try to eat her. Before they can do so she is caught up in a whirlpool caused by the volcanic activity in the area, as is Ronan, who had swum back to try to rescue her. They are rescued from the whirlpool by the mysterious deep sea otters and taken into their shielded city on the ocean floor.
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.

Book 3

Deluge

by Anne McCaffrey and Elizabeth Ann Scarborough

Published 1 January 2008
In Deluge the selkie twins, Ronan and Murel, leave Petaybee on a mission to help rescue their friend Marmie, who has been falsely arrested on the orders of a corrupt Colonel. However, the Colonel has more power in the Company than they realized and they end up being imprisoned themselves and taken to the Gwinnet Incarceration Colony. There, they have to try to evade the clutches of their old adversary Dr Mabu, an unscrupulous scientist who wants to study their unusual shape-changing ability, and doesn't care how much pain her experiments cause them. Meanwhile, the powerful and avaricious Company is making another attempt to take over the world of Petaybee for its resources, and the twins parents, Yana and Sean, along with the entire planet, must fight for the independence of their sentient world once and for all...