Recommended reading - She Who Was No More (1951):

She Who Was No More

By Pierre Boileau and Thomas Narcejac.

Filmed as Les Diaboliques, a.k.a. Diabolique, The Devils, The Fiends (1955), directed by Henri-Georges Clouzot.

ASIN: B00TNBPJ9O

Published by Pushkin Vertigo.

English language translation edition 2015.

Published 2015.

First published 1951.

Description:

Every Saturday evening, travelling salesman Ferdinand Ravinel returns to his wife, Mireille, who waits patiently for him at home. But Ferdinand has another lover, Lucienne – an ambitious doctor – and together the adulterers have devised a murderous plan.

Drugging Mireille, the pair drown her in a bathtub. But before the "accidental" death can be discovered, the corpse mysteriously disappears. So begins the unraveling of Ferdinand's plot, and his sanity.

This classic of French noir fiction was adapted for the screen by Henri-Georges Clouzot as Les Diaboliques (The Devils; The Fiends), starring Simone Signoret and Véra Clouzot, the film which in turn inspired Alfred Hitchcock's Psycho. A second movie version, Diabolique, followed in 1996, starring Sharon Stone.