"The Traitor Spy" is a fantasy novel by Trudi Canavan, part of the Black Magician trilogy. The story follows Sonea, a young woman with powerful magical abilities, as she navigates the complexities of her new life in the Magicians' Guild. In this installment, Sonea faces challenges from both external threats and internal conflicts within the guild. The plot explores themes of loyalty, betrayal, and the struggle for power, as Sonea and her allies confront a dangerous enemy who seeks to undermine their world.