"How would you like to meet a ghost in here, eh baby?"
A "which creepy doctor is the serial killer?" whodunnit! It's not great, but it's very watchable (especially if you have macabre taste like me), also it's amusing to see what criminal science they use that was actually correct and how much of it is very wrong now. Plus that early two-strip Technicolor film looks surprisingly great!
Also the above quote is going to be my new pickup line.