D4区是由美国军队使用、以测试其最新的武器并保护人民的区域。五角大楼确保这种超秘密地区受保护平民的存在。尽管采取了所有的预防措施，但还是发生了严重意外事件。美国ZF必须迅速行动，决定派遣一个救援雇佣军矫枉过正！由于时间紧迫，五角大楼前决定铲平D4区和该地区所有的人。
　　D4 follows a team of special ops mercenaries on a mission to rescue a kidnapped kid believed to be held in an abandoned government facility. Hired by the boy's mother, a wealthy doctor with high reaching influence, all seems to be an easy job. But as things unfold, what was meant to be a simple search and rescue turns into a fight for survival