Sailing Bright Eternity. Galactic Centre Book 6

The final chapter of humanity's future has begun and one man, Nigel Walmsley, has been alive through it all. An ancient scientist from the distant past, Walmsley had been marooned inside an anomaly of time and space. From here he recalls Earth's desperate struggle against the mechs, a violent artificial intelligence dedicated to total annihilation. In a strange space-time continuum called the Esty, the last few survivors from humanity's ravaged planets have taken refuge, readying themselves for a final stand against their ruthless executioners.
Three generations of men stand between the mechs and total oblivion for the human race: Toby Bishop, a young warrior-in-training; Killeen Bishop, Toby's father and leader of the last remnants of humanity; and Killeen's own father, long believed dead, but now mysteriously returned to his family. As the mechs continue to carve their swathe of destruction through the galaxy, these three men hold the sole hope for the survival of the human race.