PLO Agent Famy and IRA Agent McCoy are hired to assassinate world-famous Israeli scientist David Sokarev. They are sought by British security on the streets of London.

Sokarev reluctantly proceeds to his London engagement under the protection of veteran security agent Jimmy, an alcoholic with a maverick streak. The terrorists botch their hit and split up.

Wounded, McCoy stays at the suburban home of local girl Norah, who inexplicably loves the brutal killer. Police catch McCoy, and Jimmy pries out of him Famy's next plan: to kill Sokarev at Heathrow Airport.