The night guest

I'm excited to read The Night Guest by Fiona McFarlane (an Australian author). It's an Amazon Editors' Pick, about an older woman with a caretaker who has suspicious motives for helping her (not money, since she is being paid a pittance). The book is not out yet, but I read an excerpt and it seems really good. A tiger also comes into the plot somehow, maybe in a Life of Pi sort of way.