Harriet Denby's sister, Caroline Denby, was evil from the start, while Harriet herself was complete opposite. When KT and Eddie were trying to find out more about Miss Denby, they stumbled upon a website that gave all of Harriet's information, including a picture that was obviously not Miss Denby. Eddie had recognized this particular woman in a vision, and had seen her as significant to the mystery. At another time when Eddie was looking through Miss Denby's bag, he found a letter from Lakehouse Clinic saying that "Harriet Denby" has been in a mental institution for years. It was unknown to Sibuna that it was in fact not their teacher they where talking about, but instead the real Harriet Denby. When they went to visit her, they found out the truth about the stolen identities and the roles as Keeper.Caroline was adopted at a young age and she always hated Harriet for an unknown reason. Their father was good friends with Robert Frobisher-Smythe, and because of this friendship and Harriet's pure heart, she became Robert's Keeper. However, Caroline wanted the glory of being Keeper, so she took Harriet's identity and locked her away in Lakehouse Clinic Mental Industry. The medication eventually did make Harriet go crazy, making her say things such as, "Where's my doll? Sometimes she speaks to me." Despite her deranged state, she never lost site of her true role as Keeper.