The Behaviour Of Moths by Poppy Adams
From her lookout on the first floor, Ginny watches and waits for her younger sister to return to the crumbling mansion that was once their idyllic childhood home. Vivien has not set foot in the house since she left, forty-seven years ago; Ginny, the reclusive moth expert, has rarely ventured outside it.
But with Vivien's arrival, dark, unspoken secrets surface. Told in Ginny's unforgettable voice, this debut novel tells a disquieting story of two sisters and the ties that bind - sometimes a little too tightly.