Xanthe Fox has survived her first test as a teenage True Witch, and defeated her Hexing Witch enemy Donna - for now. Desperate to learn all she can from Grandma Alice, she spends all her free time at her house, much to the grief of Saul, who's finally plucked up the courage to ask her out. Soon Xanthe is seeing bright, glowing Xs, which are getting more powerful by the day. Convinced that a bigger hex than ever is being sparked, Xanthe knows that she must act - with or without the help of the other True Witches...