In late 2010, art collector Peter Silverman revealed that a "German, early 19th century" portrait he had bought for $19,000 was, in fact, a previously unknown drawing by Leonardo da Vinci—an exquisite depiction of Bianca Sforza, rendered 500 years ago. In Leonardo's Lost Princess, Silverman gives a riveting first-person account of how his initial suspicions of the portrait's provenance were confirmed repeatedly by scientists and art experts. He describes the path to authentication, fraught with opposition and controversy. The twists and turns of this fascinating, decade-long quest lead from art history to cutting-edge science, and from a New York art gallery to Paris, Milan, Zurich, and ultimately a Warsaw library where the final, convincing evidence that the portrait was indeed by da Vinci was found.

• Takes an up-close look at the workings of the art world and at figures ranging from dealers and connoisseurs to a suspected forger
• Discusses current scientific techniques used to investigate and authenticate works of art, such as carbon dating and cutting-edge photography
• Uses Silverman's drawing as an entree into Leonardo da Vinci's world: his studio, his style, and his methods
• Explores the intersection of art and science in the authentication process, involving the work of a man who embodied that intersection

Unearthing the secrets almost lost to history, the book is ideal reading for art lovers and anyone interested in an astounding case of "whodunit."

In 1496, a beautiful princess was preparing to marry in Milan. Bianca was the daughter of Duke Ludovico Sforza and betrothed to Galeazzo Sanseverino, commander of the duke's armies. Portraits were often commissioned during the Renaissance to mark major events in a subject's life, and a court artist named Leonardo da Vinci was given the task of memorializing Bianca.

Tragically, the princess died soon after her wedding. Then her portrait, the last evidence of her existence, was also lost.

At a New York City gallery in 2007, Peter Silverman saw a portrait catalogued as "German, early 19th century." Thinking it misattributed and regretting not buying it once before, he scooped it up for a mere $19,000 and began a long quest to discover its origins. He hardly dared utter the "L" word: Leonardo.

Giants in the field of art history and scholarship soon would, though, as the best of connoisseurship was used to authenticate La Bella Principessa. Science would then confirm their judgments. The picture was carbon-dated, digitally examined with multispectral imaging, even scrutinized for fingerprints—and one of Leonardo's was found along with a palm print. Bianca was identified as the subject, and her clothes and hair were matched to those of her period.

Many in the art community still would not believe, but Silverman persisted and, with the help of Leonardo scholar Martin Kemp, discovered its provenance: the tribute book from which the picture had been removed. After more than 500 years the beautiful princess was home again.

The picture is valued at $150 million, but its value to the art world is incalculable—and its story is unforgettable.