In 2071, Sergeant Tachikoma leads a Marine combat armor squad. She knows the Corps never promised her a rose garden, only the chance to fight for her country. Now, she faces her greatest challenge, two terrifying alien pillars that trapped her into reliving the same day again. The day she dies. Today, she needs every ounce of courage to save her people from annihilation. Based on cutting-edge theories on the nature of the universe, this white knuckle military SF thriller contains drama and mystery.