Caterina Pellegrini is a young Venetian musicologist hired by two competing cousins to find the truthful heir to an alleged treasure concealed by a once-famous, but now almost forgotten, baroque composer. Sworn to secrecy, Caterina can solve the mystery only by searching through the papers contained in the composer's two chests that have not been opened for centuries. As she delves into all quarters of his life, from professional to personal, she is drawn into one of the most scandalous affairs of the baroque era.

When her research takes her in unexpected directions, she begins to wonder what dark secrets these chests hold and just whom can she trust?