Annihilation

What they have lost, we must find.
The resistance has nearly been wiped out, its numbers reduced to a scant fraction of what they once were. Meyer has fallen. With hope nearly a memory, something must turn the tide of war.
A deadly weapon, known only as Thor's Hammer, brings promise of salvation. Now the scattered remnants of the human race must find the device and recover it before the aliens can discover its location. Because if the rampaging Astral forces beat them to the weapon, the fate of Earth will be sealed.
This relentless, pause-resisting tale of colonization and alien empire is the fourth in the Alien Invasion series by masters of story Truant and Platt, authors of The Beam, Robot Proletariat, the Dream Engine series, and many more.
Fight for hope. Search for survival.