Feersum Endjinn

A cloud of space dust is advancing on Earth, threatening to destroy all life. The task of saving the planet falls to the Chapel Engineers, an organization of scientific consciences, many of whose bodies are dead, plugged into a computer network.
Count Alandre Sessine VII has already died seven times, but the wonders of the vast net of technological memory have kept his soul alive. Now he has only one life left--one chance to catch his killer.