Critical Dawn by Darren Wearmouth

Charlie Jackson’s archaeological team find advanced technology in an undisturbed 16th Century graves. While investigating the discovery, giant sinkholes appear across planet, marking the start of Earth’s colonization and the descent of civilization.

Publisher Description

Charlie, and the rest of humanity will have to fight for survival, sacrificing the life they’ve known to protect themselves from an ancient and previously dormant enemy. Even that might not be enough as aliens exact a plan that will change the course of history forever.