The Bounty Hunter: Into The Swarm

The story of Burke and Cass continues with a return of an old foe from Burke's past. The dross, an alien infestation that has claimed several of humanity's planets, including Earth, has haunted Burke since he fought in the war against them. Now, years later, he finds himself facing them once again.
Into The Swarm follows Burke and Cass on their return to Earth, to the old battlefields and ruined cities now teeming with aliens. Where he once fought with thousands of other marines, he now fights with only his power armor and partner against overwhelming odds.