The Behaviour of Moths by Poppy Adams took me a while to get into it, and I might not have persevered if it hadn't been chosen for my book club. But I'm glad I did, after a while it definitely picked up, and maybe that just shows me that I shouldn't give up on books after a couple of pages. It also left a great deal unexplained - a little too much in my opinion and that's coming from someone who likes ambiguity in fiction.
Ginny is 70 and has lived alone in her family's falling-apart mansion for many years, when her younger sister, Vivi comes home. The two have been estranged forty+ years (although it's never really clear why or why Vivi has come home now). Ginny lives in the past, and most of the story is backstory, when Ginny and her father were Lepidoperists (moth collectors), and Vivi - the lively sister - fell out with their parents and then her sister. Gradually it becomes clear that Ginny is an unreliable narrator. The story got darker and more sinister as it went along (perhaps not all of it understandable even as I got to know the characters more) but I enjoyed it. It did well when it was published in 2008 but Poppy Adams doesn't seem to have anything else published, and I wonder why.