Heaven's Reach - David Brin - Bog

"The peaceful existence of six outcast races on Jijo has ended. Ancient enemies, the Jophur, have discovered them, preparing to subject the refugees to their dark, perverted plans. The Jijoans only hope is the same ship that accidently led their foes to the planet. The Earthship Streaker, with its crew of uplifted dolphins and a human commander, must somehow lure the Jophur into a chase through space...into the unknown. And then into the weird."--