Clara falls ill; later, she is able to read the murderer's testimony. The killer is her brother, Theodore. He claims to have been acting under divine orders. Clara is sure that Carwin is the source of Theodore's madness.
Carwin reveals to Clara that he is a biloquist. He was the cause of most of the voices, but he claims that he did not tell Theodore to commit the murders. Wieland, having escaped from prison, arrives at Clara's house and tries to kill her. Carwin uses his ability to tell Theodore to stop. He says that Theodore should not have listened to the voices, and Theodore suddenly comes to his senses. He kills himself, full of remorse for what he has done.
Clara refuses to leave her house, until it burns down one day. She then goes to Europe with her uncle, and eventually marries Pleyel. Clara feels she has finally recovered from the tragic events, enough to write them down. As for Carwin, he has become a farmer in the countryside.