The London home of Matthew Ashby is visited by the beautiful, famous half-Venetian musician, Emilia Lanier, begging him for help. A young Venetian girl, Sarah, has been accused of witchcraft by a wealthy merchant's wife, and has since disappeared. Is she in hiding? Or worse - kidnapped or murdered?So with his daughter, Celia, and his clerk, Ned, Matthew Ashby sets off for Venice and into a greater mystery than could ever be imagined. They must draw on all their wits and ingenuity to find allies in unexpected places. When Master Ashby is kidnapped, Ned and Celia have to race against the clock to find him as well as Sarah - but nothing is as it seems, not least the mysterious Madman of Venice ...