Critical Dawn by Darren Wearmouth

Aliens have planned against us for centuries... And now the attack is ready. 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. 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. Critical Dawn is the republished apocalyptic ride to the very edge of human existence. Factions will battle for control of the Earth-if they can avoid the threat of extinction. "Five stars! Epic sci-fi thriller with twists, scares, and non-stop action that'll have you up 'til dawn!" -- David W. Wright co-author of the Yesterday's Gone and WhiteSpace series. "Critical Dawn will consume you and not let you go until the very end. This is War of the Worlds if the aliens did not get sick and die, and it's not just the aliens you have to worry about.