Former nanny for Tom and Anna who recently quit. Becomes the central victim in the investigation after being reported missing and later found dead. Had a traumatic past involving the accidental drowning of her own infant. She was murdered by Tom after he caught her meeting him on the day of her disappearance.
Megan and Martha exist within the same social and residential circle.
Rachel observes Megan as a neighbor and subject of her daily train routine.
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