“[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...

Leaving Petaybee to help rescue a family friend, selkie twins Ronan and Murel are imprisoned by the Company, which wants them as workers, and an unscrupulous scientist, who hopes to study their unusual shape-changing talent.