Detailed Explanation
Adora Crellin is a killer, but not of Ann and Natalie. She suffers from Munchausen syndrome by proxy—she needs to be seen as a devoted caregiver to sick children. She poisoned Camille's sister Marian to death years before the show begins, and she nearly kills Camille the same way during the series. The show brilliantly misdirects viewers toward Adora as the main killer, making the Amma reveal even more shocking. Wind Gap has two killers, mother and daughter, each driven by different forms of pathology.