This is a pretty rare early Columbia film. It's basically the same plot as Karloff's "The Man they could not Hang" about a group of people invited to a party where they are killed off one by one. Right down to the electrified gate and spooky radio voice (I can't seriously believe Agatha Christie wasn't aware of this movie when she wrote Ten Little Indians).
I actually like it more than the Karloff movie. It does more with the premise, lasting nearly the whole film, it's darker, more cynical and the whole cast is giving it their all. Only horror people I saw are Samuel Hinds and the lawyer from the Monster Walks.