The Girl on the Train, written by Paula Hawkins, is a gripping thriller that follows the story of Rachel Watson, a woman who becomes entangled in a missing person investigation. Rachel, who is an alcoholic and struggling with her own personal demons, witnesses something shocking from the train window one day. As she tries to piece together the events of that day, she becomes increasingly involved in the lives of the people involved, including the missing woman. The Girl on the Train is a fast-paced and suspenseful novel that will keep readers guessing until the very end.