Genesis Search (The Genesis Project‪)‬

In the fourth book in the epic science-fiction saga The Genesis Project, the time-travelling, world-crossing journey of human civilisation continues, following the end of their brutal war against a host of alien foes.
With the contact of new species, the alliance formed originally by humans and the highly-evolved Gnathe is strengthening and expanding. The Council of Worlds ensures the protection of all sentient beings and the great wars fought between species become a distant memory. Peace reigns.
But it cannot last. A new threat appears when the Andromeda galaxy appears to be rapidly speeding towards their own and a destructive collision of worlds seems imminent. It soon becomes clear that an unknown force, known as the Harvester, has something to do with it. It becomes the duty of Kamiel 637 to find the cause of this strange phenomenon and stop it… fast.
Using incredible technology and armed with great knowledge, Kamiel 637 is forced to go back through time and space to alter the very course of the universe…