The Girl on the Train, written by Paula Hawkins, is a gripping psychological crime mystery that explores the blurred lines between truth and perception. The story revolves around Rachel Watson, a troubled woman who becomes entangled in a missing person investigation. As Rachel tries to piece together the events surrounding the disappearance, she becomes increasingly unreliable as a narrator. With its complex characters and atmospheric setting, The Girl on the Train is a compelling read for fans of crime mystery books.