Excalibur (Area 51 #6)

In his time at Area 51, Mike Turcotte has learned one thing: we are not alone. As part of an elite Special Forces team, the former Green Beret has encountered things that are well beyond human understanding. Now, two ancient rivals from another world are vying to dominate Earth, and Mike and his team must choose which army to side with. The key to averting the crisis lies in a single weapon: Excalibur. The mythical, legendary sword of King Arthur is real and can unlock a galactic power beyond what anyone.