A mental patient who believes he is Humphrey Bogart escapes from his institution and sets up in business as a private eye. Based on the the comic book series created by writers John Wagner and Alan Grant.

It's the day of the Orange Parade in Glasgow, but for Jon, the thrill of leading the parade and swinging the mace soon turns to horror as he learns the truth behind the costumes and songs.

In their songs, comedy and exuberant music, a travelling theatre company give a fiercely polemic account of Scottish history, from the aftermath of Culloden to the oil boom. Their production before a live audience is intercut with filmed reconstructions of the Highland Clearances and the Victorian obsession with hunting stags.