Anne McCaffrey, winner of the Hugo and Nebula Awards, co-writes this sequel to the popular first Twins of Petaybee book, Changelings with fellow Nebula Award winner Elizabeth Ann Scarborough. As the series continues, Maelstrom follows Murel and Ronan Shongili-telepathic 10-year-old twins who have the special ability to turn into river seals. Murel and Ronan have been assigned with rescuing the inhabitants of neighboring planet Halau from their doomed...