Dead Fear is a zombie fps game being developed by ExuroDev. It includes Survival, Versus and Objective mode. It is mostly a multiplayer game, so there is really no need for a story background. You can host a server with the amount of players of your choosing, and play one of the 3 modes. With a large variations of weapons to use, and awesome custom character customization you can have a lot of fun playing solo or with friends.
This is a little preview of one of the houses that's in the map "Detour".