As Earth scrambles to build its defenses, a massive fleet approaches from Epsilon Eridani. We must fight and we must win to survive. The SODIUM series hits high gear as the massive battle for Earth gets underway. Do we have what it takes or will Man's short history come to an abrupt end? Find out as the thrilling SODIUM series continues! SODIUM Gravity is the fourth thrilling book of this epic adventure. If you have yet to begin reading this series you will want to begin with the first book--SODIUM Harbinger. Grab your copy today! What are readers saying about this series?--I hope the series within the series never ends: Sodium, AMP, Omega are a trilogy of not one, not two, but 22 page turners. Great writing; thoughtful and suspenseful. There are so many great books and authors; Arseneault shares the top end of my list.----After reading 4 chapter's I was hooked, even finished it in a day.----Please write more. I would stay in this series forever if you wrote them forever.--