"Be sure you know your true heart’s desire, or you may find yourself surprised by what you receive."This is the warning the Astrologer-Sorcerer gives Giulia when she pays him to create a magical talisman for her. The scorned illegitimate daughter of a Milanese nobleman, Giulia is determined to defy the dire fate predicted by her horoscope, and use the talisman to claim what she believes is her heart’s desire: true love and a place where she belongs.The convent of Santa Marta is full of surprises. There are strict rules, long hours of work, and spiteful rivalries…but there’s also friendship, and the biggest surprise of all: a workshop of female artists who produce paintings of astonishing beauty, using a luminous blue mixed from a secret formula: Passion blue. Yet even as Giulia begins to learn the mysteries of the painter’s craft, the magic of the talisman is at work, and a forbidden romance beckons her down a path of uncertainty and danger. She is haunted by the sorcerer’s warning, and by a question: does she really know the true compass of her heart?