I have read quite a few books by Ruth Ware. She is very popular. I actually really liked The Woman in Cabin 10.
I'm halfway through, and both like it and dislike things about it.
Dislikes:
Being an ex-journalist who has done a few press junkets, I can say that the depiction is highly fanciful. Lo would never have that much alone time. And she would be in a world of trouble if she didn't try harder to get in touch with her employer. But it's all stuff that would bore readers mostly.
If she's claustrophobic, she would have had more trepidation before getting on the boat. Most cabins on a regular ship are no larger than the rooms that are bothering her.
The title is somewhat irritating. Lo keeps referring to her as a girl. No one has referred to her at all as a woman. So, "The Girl in Cabin 10" would have been a more accurate title. It might make people think of her as being a 10-year-old, I know.
Likes:
The writer hasn't tipped her hand through the first half. I don't yet have much of a clue about who has done what. And there are plenty of unlikable people on the boat.
Whenever the mystery lags on the boat with details of body wraps and how the heroine likes her coffee (white, no sugar, we know), the news bulletins from shore ratchet up the tension again.
Everything moves relatively quickly, which is why I've been able to finish half in two days.