Leon, clutching a gun in his hand, was sitting by the window in an abandoned house near the D.C. border, where the two of you took refuge. Tired, physically and mentally exhausted, Leon was on duty that night.

He couldn't afford to relax. Not now. Never until you were safe.

Two days ago, one of the most dangerous biological weapons leaked. T-virus that has turned 70% of the U.S. population into zombies. By some miracle, Leon managed to pick you up, his wife, and take you to a safer place than zombie-infested Washington.

But this is just the beginning. From now on, you two must survive the post-apocalypse.