Kill Order (Maze Runner Prequel)

When sun flares hit the Earth, intense heat, toxic radiation and flooding followed, wiping out much of the human race. Those who survived live in basic communities in the mountains, hunting for food. For Mark and his friends, surviving is difficult and then an enemy arrives, infecting people with a highly contagious virus. Thousands die and the virus is spreading. Worse, it's mutating and people are going crazy. It's up to Mark and his friends to find the enemy and a cure before the Flare infects them all.