The Girl on the Train, authored by Paula Hawkins, is a gripping psychological thriller that revolves around Rachel Watson, an alcoholic woman who becomes entangled in a missing person investigation. Rachel's life unravels as she becomes obsessed with a couple she observes from the train every day. When the woman goes missing, Rachel believes she has vital information to solve the case. With its unreliable narrator and intricate plot, The Girl on the Train is a suspenseful and addictive read.