The Shielding Shadow

The Shielding Shadow
Overview
The 15 chapter story involves the heroine being protected by a shadow with burning eyes. There's also a cloak of invisibility, some hypnotism and a giant octopus added to the mix.
Similar
Flash Gordon (1936)
Drums of Fu Manchu (1940)
The Hazards of Helen (1917)
King of the Mounties (1942)
The Woman in the Web (1918)
Cody of the Pony Express (1950)
The Lost Jungle (1934)
The Strings of Steel (1926)
The Wolf Dog (1933)
Perils of the Royal Mounted (1942)
Sea Raiders (1941)
The Phantom Rider (1946)
The King of the Kongo (1929)
The Great Gamble (1919)
The Black Coin (1936)
Beatrice Fairfax (1916)
Bruce Gentry (1949)
The Diamond from the Sky (1915)
The Great Radium Mystery (1919)
Doctor Who: The Daleks' Master Plan (1966)