Icicle: A Tensor Matrix (The Oort Chronicles, #1)

Braxton Thorpe has discovered a threat to the entire Solar System, but he has a problem: he's dead.
"There's interstellar travel, wormholes, aliens, and the threat of inter-planetary war, which, together with Braxton's personal and wider quest, adds up to one hell of an adventure. Not bad for a dead man!" —Sebastian J. Brook, Editor of Doctor Who Online
Frozen at death, Thorpe awakens to find himself uploaded into an electronic matrix. Exploring beyond the matrix and the larger GlobalNet, he discovers the Oort, a distributed electronic entity older than humanity, with an unnerving secret: aliens wiped out nearly all life on Earth once, and are coming back to do it again.
The mathematical entity that is Thorpe has to find a way to convince humans of the threat, and in time to do something about it. But how, and what?
If you've read Niven's A World Out of Time or Taylor's We Are Legion, the opening of Icicle will only "seem" familiar. Buckle up for a wild ride—you ain't seen nothin' yet!

Dr. Robert G. Williscroft is a retired submarine officer, deep-sea and saturation diver, scientist, author, and a lifelong adventurer. He spent 22 months underwater, a year in the equatorial Pacific, three years in the Arctic ice pack, and a year at the Geographic South Pole. He holds degrees in Marine Physics and Meteorology and a doctorate for developing a system to protect SCUBA divers in contaminated water. A prolific author of both non-fiction, Cold War thrillers, and hard science fiction, he lives in Centennial, Colorado.
Dr. Williscroft is a member of Colorado Author's League, Independent Association of Science Fiction & Fantasy Authors, Science Fiction Writers of America, Libertarian Futurist Society, Los Angeles Adventurers' Club, Mensa, Military Officers Association, U.S. Sub Vets, American Legion, and the NRA, and now spends most of his time writing his next book, speaking to various regional groups, and hanging out with the girl of his dreams, Jill, and her two cats.