The team try to find out whether a beautiful English landscape is a work of national importance - a lost masterpiece by John Constable and quite possibly an alternative view of his greatest work, The Hay Wain. Now owned by a Gloucestershire businessman, the painting appears to have all the hallmarks of Constable's sketches - his more impressionistic, preparatory works. If genuine, it could be worth at least £2 million.

Is a purchase from an online auction site a lost work by Australian artist Tom Roberts?

Fiona Bruce and Philip Mould investigate the history of two pictures, both of which are believed to be by Paul Gauguin, one of the giants of 19th-century art.

Fiona Bruce and art expert Philip Mould investigate the first work of sculpture featured on the show, an unusual piece called The Gazing Head, which may have been made by Alberto Giacometti in 1930s Paris. The quest to uncover the truth is complicated by the fact that the sculpture was once broken into several pieces by a cat.