The Best Episodes Directed By Ernest Day

Senior civil servants, MPs, and intelligence personnel are all dying suddenly of ""natural causes,"" and there seems to be no obvious link. The only lead is the mortally-wounded agent who talks of angels of death that kill from within.

An old flame of Purdey's reappears when a missile goes missing from an air display. But what's the connection between that, a visiting Arab envoy, and a spy satellite photographing Buckinghamshire?