- "Here is a list of odd jobs I want done."
- —Caroline to Victor
Caroline Denby is one of the main antagonists of House of Anubis in Season 3.
Caroline Denby stole her sister's identity as the Keeper. She only wanted the glory of the role. She also has the Sun key, while KT Rush has the Moon key. Both Caroline and KT can awaken The Sleeper, but if Caroline gets to it first, he'll be evil. If Sibuna awakens him before that, he'll be good. She hid her sister in a mental hospitial (because she started to have dreams of Ammut and used it against her.) Eddie and KT discover a key similar to KT's in her bag. She lives in the gatehouse and she has a tank with Robert Frobisher-Smythe inside of it, in a specific room. We then learn that the woman in the mental hospitial is the real Harriet Denby, and that the fake Harriet Denby is really her sister, Caroline. Caroline manages to kidnap Harriet, after Sibuna finding out her in the hosptial. She traps her sister in the Gatehouse. She tries the ceremony to awaken Robert, and thinks that she has failed, although she succeed. She plans to leave the school until she finds Robert in the Gatehouse. Victor then discovers her real idenity after she "decided" she'll stay for the rest of the school year. Victor is tricked into going to a sarcophagus. After her plans to awaken Robert succeed, she helps him find sinners, tries to destroy Peddie for good (which she succeeds in). In the finale she decides to try to get all the glory and to rule with Ammut, but her plan backfires -- her sister grabs her key away, taking away her immunity to Ammut, and Ammut then devours Caroline and goes down to the Underworld with her, similar to Rufus. Because of this, Caroline will not return in Season 4.