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
The Fatal Ring (1917)
Elmo the Fearless (1920)
Elmo, the Mighty (1919)
The Spider Returns (1941)
The Red Glove (1919)
Rustlers of Red Dog (1935)
The Adventures of Smilin' Jack (1943)
The Sable Lorcha (1915)
The Adventures of Kathlyn (1913)
Drums of Fu Manchu (1940)
Flash Gordon (1936)
Flying High (1926)
Scouts to the Rescue (1939)
King of the Mounties (1942)
Bride 13 (1920)
Zorro's Fighting Legion (1939)
The New Adventures of Tarzan (1935)
One Stolen Night (1929)
The Valley of Vanishing Men (1942)
The Valley of Silent Men (1922)