Tor, May 2004, 24.95, 368 pp.
The ocean contains the Twil Gate that connects the two diverse planets. Whereas the Hormling of Senal depends heavily on technology, engineering and science, the agrarian Erejhen of Irion believes in magic. Even how the two races understand the Twil Gate varies. The Hormling know that the gate had to have been developed by an unknown technologically advanced culture; the Erejhn believe the gate is a magical portal created by some wizard in a distant past.
The two planets have thrived on a brisk trade between them, as the Hormling sell manufactured goods in exchange for Erejhen farm products. However, the Hormling believe that the Erejhen are a backward race and decide that they can increase profitability and solve their over-population problem by colonizing Irion. A diplomatic team is sent to Erejhen, but instead of working on a pact, they are the advanced mission of a Hormling invasion. War is now the product moving through the gate.
This report prepared by Harriet Klausner