This is the sequel to Woman Last Seen, but I think ultimately its issue is that it's a sequel that wasn't intended, so it never quite gels. According to the author's note, it's written in a way that could be a standalone, however that means if you have read the first book, you know the first big twist already, so the buildup and reveal are just more confusing than anything. 
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The second big twist was so obvious, I'm not actually sure if it was meant to be a twist. Maybe it was just supposed to be suspenseful while the reader waits for the character to figure out what everyone else knows? And while the last 25% or so was exciting, I didn't like how one main character's personality did a complete 180 in the span of a paragraph. 
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All in all, it was a quick read, and had some exciting moments, but it's sadly not a book I would recommend.