The first part of this book is filled with techno-jargon and office intrigue, but if you are patient and keep with it for about 100 pages you'll get into the meat of the story. The secret science project that the main protagonist, Tamsin, is involved in is never really clear, only the unwanted side-effects. One of these is the appearance of doppelgängers. Naturally these must be dealt with, but the author's desire to keep things mysterious also keeps things muddled and the ending really doesn't pay off. ( )

I'm giving this very generously 3*** in recognition that a lot of other readers might like it more than I do. If you're thing is scifi with a combo of horror and thriller, you'll probably like it. Personally, it's not my cuppa and I'll probably not go on to the author's other books. It was a quick Kindle read.

The ending, I might add, was disappointingly inconclusive, perhaps as a set-up for a sequel. Again, it's a sequel I won't be reading, but best wishes to a competent writer and to her admirers. ( )

I had a fantastic time with this book! I really liked The Death of Jane Lawrence when I read it last year so I was eager to give this book a try and I liked this book just as much. I was hooked by this story from the beginning and was curious about what might be happening to Dr. Rivers. I love that the story left me questioning everything and I found it to be a very entertaining read.

The city of San Siroco is sinking and Dr. Tamsin Rivers is trying to figure out why. Her basement seems to be sinking even more than the rest of the city and a mysterious door has appeared. When she meets her doppelgänger, she does not know what to think but things start to go horribly wrong as they spend more time together. I had a great time trying to figure out how everything fit together. The story kept me guessing until the very end with plenty of twists and turns along the way, including a few really big surprises.

I listened to the audiobook and thought that Xe Sands did an amazing job with this story. I really felt like I was there with the characters experiencing this story. I thought that she did a fantastic job of bringing these characters to life by adding just the right amount of emotion to her reading. I know that her performance added to my enjoyment of this story.

I would recommend this book to others. I found this to be a rather unique story that blended the genres of horror, science fiction, and thriller quite nicely. I really enjoyed this book and look forward to reading more of this author’s work in the future.

I received a digital review copy of this book from Macmillan Audio and St. Martin’s Press. ( )