 A hired gunman with a heart holds up on his mission to carry out an assassination after befriending a widow and her son, whom he met on a camping trip. What none of them know is that the gunman carries a deadly -- and highly infectious -- disease picked up in a foreign country. The S.W.A.T. team must both track down the killer and persuade him to give up peacefully in order to get a blood sample to develop a serum for the now-desperately-ill mother and child.