ICICLE—A Tensor Matrix

 A very wealthy entrepreneur in today's world dies of cancer and his head is cryonically preserved. He awakens about a century later inside an electronic matrix. 

He discovers an existential threat to humanity and organizes its defense against an invader operating under the Dark Forest Theory: Like hunters in a "dark forest," a civilization can never be certain of an alien civilization's true intentions. The extreme distances between stars creates an insurmountable "chain of suspicion," where any two civilizations cannot communicate well enough to dissipate mistrust, making conflict inevitable.

This is the first of three books in The Oort Chronicles.