Book of 2015. The novel, which conquered all the bestseller lists on both sides of the Atlantic, broke records for the speed of sales and was called by critics as the new Gone. Need to know more? Rachel takes the morning train to London. Day after day, she looks at the cozy suburban houses, and when the train stops for a moment at the signal, she gets a regular glimpse into the privacy of the young couple. Over time, Rachel starts to feel like she knows the two people. He imagines he knows them. He even gives them names: Jason and Jess. However, one day she sees something that shocks her. It only takes a minute before the train starts moving again, and suddenly everything is different... Shortly afterwards, Rachel learns that "her" Jess is missing, so she decides to contact the police. She's not sure if she'll do more harm than good as she becomes more and more entangled in a story that isn't hers, but one that ends up turning everyone's lives upside down...