The Cat by Georges Simenon

Amidst the din of their Parisian neighbourhood, Émile and Marguerite live in total silence. After a hasty marriage in their sixties, their uneasy peace was shattered when Émile's beloved cat mysteriously disappeared and was later found dead. Branding his wife the culprit, Émile's retaliation against Marguerite's cherished parrot sparked a silent battle of wills. Now they live parallel lives, communicating only through spiteful notes, mocking glances and mute accusations. As their suspicion and resentment mount, this bitter game of psychological warfare becomes a twisted necessity, binding them together in a relentless cycle of torment from which there can only be one escape.