'The Double Kill', the second episode in Thriller's fifth series is one of the strongest episodes overall and one which will keep you guessing all the way to the final credits.
Gary Collins makes his second of three Thriller appearances - this time he is Hugh Briant, an intense American who has been hatching a plan to murder his wife, Clorissa, subject to the right opportunity presenting itself. A botched burglary is seen as the ideal means of eliminating her and Briant wastes no time in aiding potential thieves by loudly discussing his valuable collection of antiques and paintings in his local pub to anyone who will listen. Soon afterwards he discovers the clinical Max Burns in his home one evening and blackmails him into agreeing to murder Clorissa. An elaborate plan is formulated and an appropriate alibi put in place.
However things do not pan out as hoped and Briant soon finds himself as chief suspect in his wife's death. It seems that Burns has turned the tables by deviating from the script and the American is prominently in the frame for murder. But are the police keeping something from him? A chance remark from a sympathetic friend leads Briant to Burns' door and following a dramatic meeting, a stunning twist in the narrative ensues.
Excellent.