The narrator of The Possession - middle ages, established in her field and respectable - has left her partner, only to - months later - become totally unmoored when he begins a relationship with a new woman. The identity of this woman, which he does not disclose, weighs on the narrator, driving her to increasingly obsessive lengths, raising the tension as you wonder if she's going to torpedo her entire life. I read this in the same day as Fleur Jaeggy's "Sweet Days of Discipline" and they went together incredibly well!