Artistically brilliant, Giulia is blessed--or cursed--with a spirit's gift: she can hear the mysterious singing of the colors as she creates them in the convent workshop of Maestra Humilità. It's here that Giulia, forced into the convent against her will, has found unexpected happiness and rekindled her passion to become a painter--an impossible dream for any woman in fifteenth-century Italy. But when a dying Humilità bequeaths Giulia her most prized possession--the secret formula for the luminously beautiful paint called Passion blue--Giulia realizes she's in danger from those who have long coveted the famous color.