Actor Richard Johnson wrote the original story for this taut suspense drama that stars
Rod Steiger as Niall Hennessy, a man who plans to blow up the British Parliament in retaliation for the accidental death of his family in Belfast. Johnson plays Scotland Yard-inspector Hollis, an expert in the struggles of Ireland, who under Commander Rice (
Trevor Howard) attempts to locate Hennessy. Hennessy has journeyed to London with a plan to substitute himself for MP Burgess (Hugh Moxey) and, wiring himself up as a human bomb, to destroy the British power structure. In a twist, IRA leader Tobin (
Eric Porter), realizing that the explosion will lead to more British repression on Northern Ireland, also travels to London to try to kill Hennessy before he can explode his bomb. ~ Paul Brenner, All Movie Guide