Sherlock Holmes and Doctor Watson get involved with Balkan terrorists to save Emperor Franz Joseph I of Austria from an assassination at the opera house and prevent World War I.

---

Main Cast: Christopher Lee, Patrick Macnee, Morgan Fairchild, John Bennett, Michael Siberry, Dominic Jephcott, Frank Middlemass, James Bree, Tom Chadbon, Paul Humpoletz

Director: Peter Sasdy

Writers: Bob Shayne, H.R.F. Keating

Editor:

Cinematographer: Brian West

---

Popular Double Features