The Girl on the Train, written by Paula Hawkins, is a gripping urban mystery fiction book set in London. The story revolves around Rachel Watson, a troubled woman who becomes entangled in a missing person investigation. As Rachel tries to uncover the truth, she becomes a witness and a suspect, blurring the lines between reality and her own imagination. With its unreliable narrator and atmospheric setting, The Girl on the Train is a suspenseful and atmospheric read that will keep you guessing until the final pages.