The Girl on the Train, written by Paula Hawkins, is a captivating urban mystery fiction book. The story follows Rachel Watson, a woman who becomes entangled in a missing person investigation after witnessing something suspicious from her train window. As Rachel delves deeper into the mystery, she uncovers shocking secrets and finds herself in danger. With its atmospheric setting and unreliable narrator, The Girl on the Train is a must-read for fans of urban mystery fiction.