The Girl on the Train is a thrilling psychological suspense novel written by Y. It follows the story of Rachel, a woman who becomes entangled in a missing person investigation after witnessing something shocking from her daily train commute. As Rachel delves deeper into the mystery, she unravels dark secrets and discovers the power of her own intuition. With its gripping narrative and unpredictable twists, The Girl on the Train keeps readers on the edge of their seats, making it a popular choice among fans of suspenseful thrillers.