The team investigates whether a small watercolour sketch could be by the British 20th-century sculptor Henry Moore. It is thought to be the only piece of a British artist in a Nazi hoard of around 1,500 works discovered in Germany in 2012. Known as the Gurlitt hoard, these works are now housed in the Museum of Fine Art in Bern, Switzerland. Every piece in the hoard has to be researched - if it was art stolen or looted from Jewish families, it should be returned.