A dangerous amnesiac escapes from an asylum, hides in the opera house, and is suspected of getting revenge on those who tried to murder him 13 years ago.
While visiting the circus with his family, Charlie is recruited by the big top's co-owner to investigate threatening letters that he's received.
Captain Donald King is sent to India to carry out a secret mission while the Black Watch, his regiment, leaves for France at the outbreak of the First World War.
