A war-traumatized veteran struggling with post-traumatic stress disorder (PTSD) was unexpectedly stranded on the Tobin Memorial Bridge in Boston.While he was walking with his young sister, a group of heavily armed radicals composed of former soldiers suddenly launched an attack, robbing everyone on the bridge as hostage.At this moment, he not only has to face the pain that has not healed in his heart, but also has to protect his only relative in desperate situations.