By the time my debut novel came out in 2013, I had honed a one-word answer for when people asked me what the book was about: loneliness. Of course, it was about a lot more than that (immortality, magical realism, an enchanted herb, partition-era Poland, World War II, 1940s country music stars), but people can relate to loneliness—who hasn’t felt, at some point in their life, on the outside looking in? But now my second novel, The Summer She Was Under Water, has come out, and I’m struggling with that one-word answer. Often, I say the book is about a dysfunctional family, another great sales generator (just ask Jonathan Franzen or Gillian Flynn). That answer feels disingenuous, though, because there is a much more direct (and more uncomfortable), word to describe it: incest. Brother-sister incest, if you want to be really specific.