Golly this was a slow burner, but so worth it. I wasn't sure at about a quarter of the way through but then I found myself thinking about the protagonist and then wanting to go back and find out what happens. It's extremely realistic, so numerous slow boat journeys, days of travelling and recovery from illness detailed over days, but builds into a really exciting denouement that I hustled through so fast I might have to go back and read it again. It's not a spoiler if I say that the part where Emily points at the end is so good. And the final line is lovely.