Citadel

"Citadel" by John Ringo is an epic sci-fi adventure about humanity's struggle to defend itself against alien conquerors in the galactic milieu. Earth has managed to reclaim the Sol system with the help of Troy, a two trillion ton battlestation created by eccentric billionaire Tyler Vernon. But when their only ally is crushed, the war becomes even more daunting. With its vivid cast of characters, "Citadel" follows the paths of Marines, Navy personnel, and civilians as they fight to save Earth and prevent the apocalypse. Will they succeed or will the Troias and Rangora Empire prevail? Discover in this thrilling page-turner.