First broadcast 27th October 1979.
After a bomb goes off in the CI5 building and an operative is killed, Cowley gets a sinister phone call to say there will be more deaths.
Gordon Jackson - George Cowley
Martin Shaw - Doyle
Lewis Collins - Bodie
Simon Rouse - Phillips
Sally Harrison - Susan
Norman Gregory - Lake
Christopher Fairbank - Billy (as Chris Fairbank)
Ian Gelder - King
Paul Antony-Barber - Matheson
Ben Thomas - Williams
James Smith - Pennington
Leo Dolan - Murray
Peter Jolley - Parks
Bill Treacher - Dave
Martha Nairn - Lisa Wakeman
Terry Yorke - Philip Catrell (as Terry York)
David Gretton - 1st Doctor
Nalini Moonasar - 2nd Doctor
Maxwell Craig - Bystander at Bomb Blast
Fred Wood - Passerby (during raid)
