The gripping miniseries ‘Baby Reindeer’ is based on the true story of comedian Richard Gadd’s experience with a stalker named Martha. While the character’s real name remains unknown, fans speculate that she is based on Fiona Harvey, a woman who reportedly stalked an MP and his wife in the early 2000s. Despite similarities in their behavior and circumstances, Gadd has chosen to protect Martha’s true identity and has fictionalized aspects of her character.