It is May 1980 in Londonderry, Northern Ireland. An undercover operator with a secret intelligence unit is murdered when he discovers that an American oil tycoon is about to fund the vicious leader of an IRA splinter cell. As the unit mounts an unofficial operation to kill the tycoon they are forced to recruit a most unlikely assassin. This is a story of murder, treachery and double-cross where not everyone is as they first appear.