Recovering alcoholic who rides a train daily, fixating on her ex-husband Tom, his new wife Anna, and their neighbors. Suffers from blackouts and false memories implanted by Tom. Becomes central to the investigation of Megan's disappearance after waking up covered in blood. Ultimately sober, discovers Tom murdered Megan, and kills Tom in self-defense to save herself and Anna.
Rachel observes Megan as a neighbor and subject of her daily train routine.
Rachel and Martha share a routine commuter relationship on the train.
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