Former US Navy SEAL Frank Marshall is a dangerously messed up individual.

Haunted by thousands of innocent deaths, Frank's mission in life is to make those responsible pay, and that means stepping back onto the grid…where men of violence are waiting to kill him. Across the Atlantic, a ruthless London gangster has given Border Force officer Roy Sullivan an ultimatum-take part in a criminal enterprise or watch his young son suffer the consequences. Now an impending global disaster is about to throw the two men together, a horrifying conspiracy that will decimate humanity and usher in a brutal new dawn for mankind. To stop it, Frank and Roy must join forces... Or three billion people are going to die.