The Girl on the Train is a gripping psychological thriller written by Paula Hawkins. The story revolves around Rachel Watson, a woman who becomes entangled in a missing person investigation. Rachel, who is an alcoholic and struggling with her own personal demons, becomes obsessed with the lives of a couple she sees from the train every day. When the woman goes missing, Rachel believes she may have witnessed something crucial to the case. The book is filled with twists and turns, keeping readers guessing until the very end. With its unreliable narrator and suspenseful plot, The Girl on the Train is a page-turner that will keep you hooked from start to finish.