At the moment of their deaths, famous people from history are snatched by a watchful and benevolent species. They are given the responsibility to covertly protect Earth, throughout time, from any peril.

Eventually, they find themselves involved in an intergalactic war threatening Earth from a ruthless invader. These historical figures must enlist the help and trust of current-day political leaders and modern militaries to face this evil conqueror, without panicking the planet's population. They must overcome obstacles of confusion, fear, mistrust, and personal power struggles. All of this is continually complicated with underlying layers of espionage, murder, romance, and threats of global terror.