Unknown to her - for how could anyone suspect the subsequent events? - falling in love with a trainee doctor, Mounir (Tahir Rahim), will set the life of the young, carefree teacher Murielle (Émilie Dequenne) on a course bound for tragedy.
After a blissful courtship, the two marry and, at the suggestion of Mounir's elder mentor Dr Pinget (Niels Arestrup), with whom Mounir has lived for some time, they move into the older man's household.
It's a supremely comfortable life; at least at first.
But it's clear that Dr Pinget has little time for Murielle, and, as time passes and her four children are born, Murielle little-by-little has the spirit crushed out of her, until, in desperation, she commits a heinous act.
Shocking as her crime (which opens the film) is, Lafosse employs his moving work to explore, as the French title of the film À perdre la raison (Loss of Reason) suggests, how a normal, happy, loving person could be pushed to such extremes.
In French and Arabic, with English subtitles.
(2012) Cert: 15