Book 1 in the series. Bound by limits dictated by society, Art Historian Nicolas Halstead lived a guarded life until a tempest in the form of Elenora Schwaab blew into his world. At first Nicolas can't decide if the audacious American is simply mad or plotting blackmail for not only does she declare knowledge of his homosexuality, she offers him a marriage proposal. After Ellie tells him of a previously unknown work of Leonardo da Vinci, a book of erotic love poems and sketches dedicated to the artist's long-time lover Salai, Nicolas joins her in a race to save the book from destruction....