In a chance encounter with a seemingly insignificant woman, Sarah Marlowe's annoyance quickly transforms into a haunting suspicion. Little does she know that this encounter will plunge her into a web of unimaginable darkness. As Sarah stumbles upon a chilling newspaper headline detailing the murder of an elderly woman on a train, she becomes entangled in a sinister game of secrets and deceit. With each step closer to the truth, Sarah realizes that her life is in grave danger.