Priceless : At two international auction houses, fine art experts vie to get the world's most fabulous and expensive paintings into their salerooms. At Ludbrooks of London, Lizzy Duffy does her best get ahead as an auctioneer, while her boss Nat Wilde takes advantage of her in more ways than one. Meanwhile Carrie Klein, number two fine art expert at Ehrenpreis in New York has been charged with opening Ehrenpreis's new operation in London, and she's determined that it's going to make her name. And in a draughty farmhouse in Cornwall, impoverished artist Serena Macdonald struggles to support her young daughter by painting family pets. Until a mistake leads to a cottage industry in 'old masters' - and a daring sting...