The One Who Got Away - Caroline Overington

I picked up this book a couple of days ago from my local library after having placed a hold on it a month or so ago. 
Now that I have finished it, I can say that The One Who Got Away is a really fantastic read, and definitely worth waiting for.
The book begins with a character named Molly telling the story of her step-sister Loren Wynne-Estes, as she learns from their father that Loren has gone missing whilst on a cruise ship with her husband, David Wynne-Estes.
Immediately, there are so many questions the reader faces: What could have happened to Loren? Was it an accident, or something more sinister? Did David play any role in Loren's disappearance?
The book is told from different perspectives (much like Gillian Flynn's Gone Girl), and there were other similarities to Gone Girl throughout, which wasn't an entirely bad thing in my opinion.
Whilst Loren's marriage to David seems perfect initially, as the reader delves deeper into their relationship, we discover a lot of lies, mistrust, and betrayals.
The story is highly entertaining, and I finished the book within a couple of days as I simply had to know what had happened to Loren. 
The twist at the ending was so unexpected that I had to go back and re-read the last couple of pages as I just didn't see it coming!
This is a really clever psychological thriller that draws you in and keeps you riveted until the last page. Even the title of the book is clever, and it's true meaning is discovered right at the end.
I would highly recommend this book, particularly for fans of Gillian Flynn.