Hello readers, I hope you are having a delightful day. I watched this film earlier today based on a book by the same name, and thought it was worth writing about.

Investigative Detective Blacklock, played by the still very beautiful Kiera Knightley, is going through a hard time. A source for one of her stories was recently murdered. So, she takes the opportunity to follow up on a fluff piece about a group of wealthy people, who will make a contribution to cancer research after one of them gets a terminal prognosis. Little does she realize that an ex is also on the boat.

I did wonder if they could make this film, with most of the action happening on a large yacht. But it pulls it off. Things go into high gear when our investigator sees a body in the water from Cabin 10. The only problem is that they don’t find it, and nobody is missing. Did she really see a body, or did her mind conjure it up? The rest of the people on the ship are definitely convinced it is.

What follows is a thriller full of intrigue and menace. Will our intrepid heroine figure it all out? It all makes sense at just the right time, turning into a classic tale of backstabbing and revenge.

As of October 2025, this film can be viewed on Netflix. I give it four stars out of five.

Have you seen it?

What did you think? Let me know in the comments.