The Man Who Turned to Stone (1957).

The Scoop:
A cabal of mad scientists trying to live forever use the front of running a reform school for girls in order who have a fresh supply nubile young women to drain of their life force. After a crusading young case worker notices the death toll rising a little too much, she and a generic do-gooder scientist guy team up to uncover the truth.

It's all pretty standard fare that distinguished by -- well, by nothing, really. The execution fails to live up the premise as no '50s B-movie cliche is left unturned. Even if you're an enthusiast of the genre, you'll likely forget it a half hour after its over.

(And for what it's worth, a man does indeed turn to stone, but it's a huge anticlimax.)

Best Line:
"Those twisted features... He may be a mongoloid."

Side Note:
Screenwriter Bernard Gordon was a victim of the Hollywood Ten blacklist, and worked for several years under the pseudonym Raymond T. Marcus. He is also responsible for penning such classic scripts as "Day of the Triffids" (1962), "Earth vs. the Flying Saucers" (1956), "Zombies of Mora Tau" (1957) and "Krakatoa, East of Java" (1969).

Companion Viewing:
"The Wasp Woman" (1957).

Links:
IMDb.

Take a Look:
This is a movie so anonymous, it doesn't even exist on YouTube. Someday I'll get it together enough to post my own clips. Until then, you'll just have to use your imagination. (Sorry!)