This video is called Alan Rickman: Therese Raquin (1980).
From London daily The Morning Star:
THEATRE: Therese Raquin
National Theatre/Lyttelton, London SE1
NINETEENTH CENTURY PSYCHO: Emile Zola’s Therese Raquin.
The critics accused him of writing pornography and dismissed the novella as putrid literature, garbage and a quagmire of slime. It was excellent for sales.
Zola published a wittily sarcastic defence in which he explained that he was a naturalist novelist, no different to a surgeon dissecting a corpse.
He was dissecting the animal side of human behaviour.
He turned the novel into a play in 1873, but it hasn’t been seen in Britain for a very long time.
Therese Raquin, who is unhappily married to Camille, a sickly, childish, sexless mummy’s boy, is having an affair with Laurent, Camille’s best friend.
They decide to kill him, only to discover that the murder, far from setting them free, has killed their desire for each other.
See also here.