This superb thriller has been called a “twisty mystery.” That is perhaps a pretty good description, but it’s not really a murder mystery … or is it? The main character, Lo, a travel magazine writer, is on a promotional cruise to see the northern lights off the Norway coast. She hears a splash in the middle of the night, what she thinks is a body being thrown overboard from the cabin next door, Cabin 10. But is it a murder or an artifact of her drunken state? There was a young woman in that cabin but she seems to have disappeared.
I think of this as more of a thriller than a mystery, although the plot is mysterious enough. There are no police and there is no body. The suspense comes from trying to determine whether Lo is delusional, whom she can trust, and what dark doings are going on aboard, if any. Is this a psychological thriller about a disturbed woman’s mental state or a tale of avarice and killing? I’m not telling.