The summary of this film isn't quite right. It is NOT about an old mansion but students at a college are killed--the first in the dorm, another at an assembly. Will there be a third?!
When a student is found hung outside his room, the coroner rules it's a murder--as the body was already dead before he was hung. It seems some sort of deadly needle was shot into the base of the victim's skull! Surely this is a VERY sophisticated murder, so it seems odd that they'd use the clumsy ruse of a hanging to hide the killing. It seems even odder that they'd ask one of the student's fathers to help investigate the crime--especially since he's not a detective but a corporate lawyer! Non-police investigating crimes was common in 1930s and 40s films, but usually they are amateur detectives or adventurers such as the Saint or Bulldog Drummond--here, he's just some lawyer who has had dreams of becoming a gumshoe! This weird plot isn't helped any by the crime itself. While it's supposed to be a mystery, I figured out who the murderer was about halfway through the film. It also was silly how complicated the murders were--they just weren't very practical or believable--more like a B-movie murder than one that could really happen. Overall, a somewhat competent movie that isn't completely bad---it just isn't all that good, either. And, I had to laugh at the old cliché where EVERY TIME A PERSON WAS ABOUT TO TALK, they were soon killed!! Gimme a break! You could do a lot better than this one by watching any of the Charlie Chan films!