Deep in the heart of Wiltshire, John Mannering steps into the home of an old lady who wishes him to value her paintings. He has no idea that he is also walking into a hornet's nest of blackmail, arson, and murder. Under the watchful eyes of masterpieces, the Baron must battle for the truth. Who was blackmailing whom? Why were people out to kill him? What is the girl, Joanna, hiding?