Down at the docks, a very enterprising but dangerous element is making life miserable for Sheriff Marga. But she's distracted at the moment by a series of puzzling kidnappings plaguing her parish. Could the culprit be the mysterious dance-hall queen of the docks? Or could it be an even more sinister figure -- The Killer Tarantula? It's a race against the evildoer as Marga tries to interview the many suspects before they, too, disappear.