The Woman in Cabin 10 by Ruth Ware

 The Woman in Cabin 10 by Ruth Ware-341 pages

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Laura "Lo" Blacklock is a journalist for Velocity magazine and is given an assignment to sail on the maiden voyage of the Aurora, a luxury yacht owned by Lord Richard Bullmer. As the voyage begins, Lo starts to realize all is not as it seems on this boat. Her first clue that something strange is going on is that she sees a beautiful young woman in the cabin next door (the titular Cabin 10) when the cabin is supposed to be empty. Who is this young woman and why was she in Cabin 10? Just what is going on aboard this boat? 

I found this to be a page-turning thriller with a somewhat surprising, open-ended ending.