The Girl on the Train, written by Paula Hawkins, is a gripping psychological thriller with elements of conspiracy mystery. The story revolves around Rachel Watson, a troubled woman who becomes obsessed with a seemingly perfect couple she observes from her daily train commute. When the woman from the couple goes missing, Rachel becomes entangled in the investigation and starts to question her own memories and actions. As she delves deeper into the mystery, she uncovers shocking secrets and realizes that nothing is as it seems. The Girl on the Train is a suspenseful and atmospheric novel that keeps readers guessing until the final pages.