this be a strange film . a bit horror and certainly film noir . some fifth columnist meet and mysteriously start die off with a japanese dagger in their hand after monsieur colomb ( bela lugosi ) show up . soon the lone ranger arrive in the person of fbi agent richard dick martin ( clayton moore ) . martin be ineffective in find the killer a he be more interested in the niece ( joan barclay ) of a missing doctor and who be part of the gang . after the last man dy and and the doctor be horribly disfigure by some strange serum and the true story of the group come out and that be where it get interesting and weird . i would not spill it . lugosi be marvelous a the skulk killer .