Fiona Bruce and Philip Mould investigate a small watercolour sketch that could be the work of sculptor Henry Moore. The piece was found in 2012 in a hoard of artwork stolen by the Nazis. While the unidentified piece has many characteristics of Moore's work, none of the other artworks recovered were by British artists, so it remains a mystery how it came to be there. The team must not only find out who created it, but also who it belonged to, since it may have been looted from Jewish owners during the Holocaust and will need to be returned to surviving descendants.