Dr. Paul Carruthers, feeling betrayed by his employers Mary Heath and Henry Morton over financial disputes, plots a sinister revenge. He genetically engineers bats to double their size and conditions them to strike at the scent of a unique perfume he concocts. Disguised in a lotion, he gifts this deadly concoction to Mary and Henry. Their subsequent deaths trigger the curiosity of a determined newspaper reporter, who delves into the mysterious circumstances surrounding the chilling events. As the investigation unfolds, secrets and dark motivations come to light in this thrilling tale of vengeance.