Multiple award-winning Canadian author Sawyer offers an epic hard-science space adventure full of technical descriptions of starships and physics tempered by human concerns. In 2094, scientists on the Starplex study the mysterious artificial wormholes that make space travel routine and convenient. Then the wormholes' creators appear, and the scientists must understand and communicate with them to save the galaxy. Highly recommended for sf collections. Copyright 1996 Reed Business Information, Inc.