The Safekeep by Yael van der Wouden

Bomb craters have been filled, buildings reconstructed, and the war is well and truly over. Living alone in her late mother's country home, Isabel's life is as it should be: led by routine and discipline.

But all is upended when her brother Louis delivers his graceless new girlfriend, Eva, at Isabel's doorstep-as a guest, there to stay for the season... Eva is Isabel's antithesis: sleeps late, wakes late, walks loudly through the house and touches things she shouldn't. In response Isabel develops a fury-fuelled obsession, and when things start disappearing around the house-a spoon, a knife, a bowl-Isabel' suspicions spiral out of control.

In the sweltering peak of summer, Isabel's paranoia gives way to desire - leading to a discovery that unravels all Isabel has ever known. The war might not be well and truly over after all, and neither Eva - nor the house in which they live - are what they seem.