Vestido de Novia (Wedding Dress) by Pierre Lemaitre

This looks very dramatic! A diabolical thriller ....
Do not let anyone reveal any of this story to you. Sophie Duguet, the protagonist of this novel, does not understand what is happening to her: she loses objects, forgets situations and is arrested in a supermarket for petty thefts that she does not remember committing. And the corpses begin to accumulate around her ... And we can no longer reveal anything more about this thriller in order to keep intact the chilling pleasure of reading and the reader's addictive search for the truth.

(Here's the Spanish blurb, in case you speak it: No dejes que nadie te desvele nada de esta historia. Sophie Duguet, la protagonista de esta novela, no entiende qué le sucede: pierde objetos, olvida situaciones y es detenida en un supermercado por pequeños robos que no recuerda haber cometido. Y los cadáveres comienzan a acumularse a su alrededor… Y ya no podemos desvelar nada más de este thriller para así mantener intacto el escalofriante placer de la lectura y la adictiva búsqueda de la verdad por parte del lector.)