Marian is Camille's deceased little sister.
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Camille’s deceased younger sister, Marian, was a sickly child with whom Camille nonetheless forged a close friendship. Marian died when she was young, leaving Camille devastated and traumatized. It is eventually revealed that Adora herself killed Marian, sickening her through years of poisoning as a result of Munchausen by Proxy syndrome. Throughout the novel, Camille’s memories of Marian resurface with increasing intensity, culminating in Camille eventually experiencing a vision of Marian telling her that it isn’t safe for her to be in Adora’s house any longer—a vision which Camille does not heed as she commits to exposing, once and for all, the truth of what her mother did to her sister.