After surviving the first wave of zombies, John and Sam take a step forward and decide to join the others survivor to look for the truth behind the terrible worldwide zombie infection. Through several locations they will search for the ones responsible of the disaster. Do they will have a chance to discover the answers they are looking for? Is there any way to recover the infected people? John will have to use all his powers to get the answers in time, because there is almost no time to have to recover the health of the infected people.