Graham Callahan, former CDC Director, is unaware that his business trip was not accidental. Edward, his oldest son, called to inform him of the evacuation and a strange flu virus. Turning most people into mindless, vicious killing machines. The outbreak destroyed the world. Dr. Callahan and his son search to find one another and the cure for the virus. With hope and ambition, this will stop the virus and possibly unite a family and the world.

Witness this tragic derailment of a family lucky enough to escape with their lives. They eventually realize it's not just a regular flu, and mysterious events occur. Dr. Callahan searches for the truth behind the Redd Door.