This is the fourth film in the MGM "Timeless Horror" set, along with Face of Marble, I Bury the Living, and Four Skulls of Jonathan Drake.
The film starts in 1890, with a herpetologist administering snake venom in a successful treatment for his wife's mental illness. But when she's pregnant, should he stop the treatment and risk the baby being insane, or continue the treatment? (Guess his choice…) 
And the only midwife that will come to the "house of snakes" is also the local witch…
But at least the aged local doctor is there at the birth.
The baby is pronounced dead, but the eyes are moving – it is cold to the touch! It looks at the mother, and the mother dies – was it the evil eye?
The midwife knows evil when she sees it, and when they will not let her kill the baby, she goes to the village. This is darkest Northumbria, so it is easy to gather villagers with torches!
The herpetolist's house is burned down, he dies in the inferno, the doctor rescues the baby and gives it to a shepherd to save its life… and the movie jumps forward 17 years. Now the village has a plague of snakebite victims, and Scotland Yard investigates.
Unfortunately, the movie doesn't do much with the premise. The snake woman is rather cool – just a spooky girl in a torn dress, but she can't blink – but she never does anything interesting.
I thought the acting was mostly fine, with what I guess are Northumbrian accents? The herpetologist has a strong resemblance to Niles from Frazier! The movie starts slow, gets more entertaining when Scotland Yard arrives, then fizzles out.
There is a bit of voodoo (in Northumbria?), and the movie veers awkwardly from "science" to complete fantasy.
It does make me think of two HoTT armies, though…
The Snake army would have a Snake Woman shaman (she has some powers which kind of work like spells), and then cobras and fer de lances.
The Villagers would have a Scotland Yard hero, a retired scholar cleric, a madwoman (shaman), a doctor with a shotgun, and villagers with torches!
experiments to find a better way to mount aircraft for wargaming.
