4.5 stars. Being proclaimed as the new Gone Girl is big shoes to fill indeed, but this book makes a very credible comparator, despite not, in my opinion, being quite as tightly woven. But the similarities are there - the twists, the tension, the unreliable narrators and the wife gone AWOL. 
 This is a very well written (the raw and lonely way Rachel was written was brilliant) and exciting thriller - I couldn't see where it was going at all and had a hard time putting this down once I got absorbed. It's definitely tense and I loved the Britishness of it all - quietly brooding and very observational. Really clever, and really rather good (said in my British accent).