This book was so excellent it had me reading the acknowledgements and circling reading discussion group questions desperate to talk to someone about. Gillian Flynn has an incredibly clever mind to characterise two people so psychologically disturbing! It was a brilliant choice to write both characters from the first person because it changes the readers perception of what is real and who to trust, as well as leaving narrative gaps - "what is this narrator missing out? why?" There was always more shock value when the reader may assume things have been resolved again. I couldn't recommend more, and I will be watching the adaptation soon!