The Girl on the Train by Paula Hawkins

Rachel, an alcoholic, commutes daily and fantasizes about a seemingly perfect couple she sees from the train. When the woman goes missing, Rachel becomes entangled in the case. The novel shifts between unreliable narrators, deepening the suspense. Hawkins explores addiction, trauma, and deception in relationships. Each chapter unravels new twists that keep the reader hooked. The psychological depth and shocking turns make this a modern thriller classic.