Fake or Fortune returns for a fifth series, beginning with one of the most challenging cases the team has ever encountered. Can art detectives Philip Mould and Fiona Bruce prove that a painting of a man in a black cravat is one of the first pictures ever painted by celebrated and controversial British artist Lucian Freud, even though Freud himself denied painting it? London-based designer Jon Turner is eager to prove that a painting he inherited from two friends is in fact an early portrait painted by Freud whilst at art school in 1939. If it's genuine, it could be worth around half a million pounds. But who is the mysterious man in the portrait - and why did Freud deny it was his work? As the team hunt for clues, they are drawn into a world of feuds, rivalries and intrigue. Can those who knew Freud best help unlock the painting's secrets?