Continue the journey with Book 4 of the blockbuster Alien Invasion series; the breakout sci-fi series with over 1000 5-star reviews . 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 the 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. Fight for hope. Search for survival.  This relentless, page-turning tale of colonization and alien empire is the fourth in the completed Alien Invasion series.