Should have been on Antiques Roadshow...

A striking portrait of a young woman in Renaissance dress originally sold in 2007 for around $20,000...fast forward to the present and the portrait is now thought to be an undiscovered masterwork by Leonardo da Vinci worth - wait for it - more than $100 million. NOVA meets a new breed of experts who are approaching "cold case" art mysteries as if they were crime scenes, and follows art sleuths as they deploy new techniques to combat the multi-billion dollar criminal market in stolen and fraudulent art...Nova...8pm