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 Spider Returns (1941)
The King of the Kongo (1929)
The Phantom Rider (1946)
Perils of the Royal Mounted (1942)
Custer's Last Stand (1936)
Flash Gordon (1936)
The Secret of the Submarine (1915)
Drums of Fu Manchu (1940)
The Phantom Rider (1936)
The Wolf Dog (1933)
Troopers Three (1930)
King of the Forest Rangers (1946)
The Spider's Web (1938)
Mandrake the Magician (1939)
The Scarlet Horseman (1946)
Adventures of Red Ryder (1940)
Jesse James Rides Again (1947)
Sea Raiders (1941)
The Strings of Steel (1926)
The Diamond from the Sky (1915)