Paul McAuley 
Into Everywhere 

The Jackaroo, those enigmatic aliens who claim to have come to help, gave humanity access to worlds littered with ruins and scraps of technology left by long-dead client races. But although people have found new uses for alien technology, that technology may have found its own uses for people.The dissolute scion of a powerful merchant family, and a woman living in seclusion with only her dog and her demons for company, have become infected by a copies of a powerful chunk of alien code. Driven to discover what it wants from them, they become caught up in a conflict between a policeman allied to the Jackaroo and the laminated brain of a scientific wizard, and a mystery that spans light years and centuries. Humanity is about to discover why the Jackaroo came to help us, and how that help is shaping the end of human history.