The survivors have spent a difficult winter moving from place to place trying to stay clear of the walkers and constantly looking for food. Lori is now at the advanced stage of her pregnancy but it's obvious that she and Rick aren't getting along. When they notice a prison in the distance, Rick convinces them it may be just what they're looking for with the possibility of food and medicine being available. They have to fight their way in, eliminating a large number of walkers but they soon settle into a secure prison block. Several of them set off to explore the prison but are soon surrounded by walkers. They aren't the only survivors in the prison either.