The Girl on the Train, written by Paula Hawkins, is a thrilling psychological mystery that follows Rachel Watson, a troubled woman who becomes entangled in a missing person investigation. Rachel's daily train commute takes her past the house of a seemingly perfect couple, but when the wife goes missing, Rachel becomes obsessed with uncovering the truth. The Girl on the Train is a gripping and atmospheric novel that explores themes of memory, obsession, and the complexities of human relationships.