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 and environmentally unsound home. But when they arrive at Halau, they find the planet even further destroyed by an unexpected meteor. Their rescue mission is made more dangerous by the discovery of an evil aquatic alien race and the suspicious arrest of their friend Marmion. Murel and Ronan are determined to defeat the Powers That Be and save all the inhabitants of Halau, no matter what the cost.