Two mothers – one overmothering, one undermothering, form the core of this novel about intruders. The initial “trespass” starts off small, laughably small and petty. The initial cast of characters is affluent, well educated, smug even, but then the story skillfully takes us outside the borders of this familiar world. The author portrays successive betrayals which grow increasingly deep, inhuman and shocking. I wasn’t crazy about the end, which left me saying “Huh”. However, this novel works on very many levels and I enjoyed it a lot. I highly recommend it and look forward to rereading it.