Aline is a woman from Hamburg whom Christian eventually marries and with whom he (apparently) has a child. Aline’s presence in Christian’s life creates tension between Christian and his family because she is of questionable reputation (she does not have a title, and it’s implied that she has had multiple children outside of marriage). Toward the end of the book, Aline convinces Christian to enter a psychiatric institution, after which she takes advantage of his inheritance to live the life of independence she has come to prefer. Tony implies that Aline is conspiring with medical staff to keep Christian institutionalized indefinitely, though this is never confirmed.