Absent-minded boffin Professor Hasdane (Tony Quinn) invents a booby trap fountain pen packed with a revolutionary new explosive that is detonated by the sound of Big Ben tolling the hour – and then leaves it in a taxi.
It is picked up by Sammy (Harry Fowler) who works for dodgy nightclub owner Mr Hunter (Sydney Tafler) who – coincidentally – sells drugs which are hidden inside pens . . .
The hunt is on in a slow-moving thriller.
Hunter
Sydney Tafler
Jackie
Patti Morgan
Sammy
Harry Fowler
Professor Hasdane
Tony Quinn
Major Cunliffe
John Watson
Syd
Fred McNaughton
Richards
Richard Shaw
Bentley
Jacques Cey
Barry
Max Butterfield
Director
Henry Cass