A Hidden Fire by Elizabeth Hunter
No secret stays hidden forever.
A phone call from an old friend sets mysterious book researcher Giovanni Vecchio back on the path of a mystery that has eluded him for centuries. Little does he suspect a young librarian holds the key to an ancient secret, nor could he expect the danger Beatrice De Novo would attract.
Now both will follow a twisted maze leading from the archives of a university library, through the fires of Renaissance Florence, and toward a passion that could destroy them both.