Prunella Ransome stars as Barbara Carey in this Gothic style giallo. Arriving in Italy to visit her blind sister who was enrolled in a classical music academy, she discovers she has been missing for three weeks. Unfortunately, a string of grisly murders have left several blind girls dead with the remains being discovered at the bottom of the ocean floor! With help from the local British Embassy and the Italian police, Barbara must pose as a blind woman in order to lure the killer to the surface! The clues lead her to Seagull Island, only nobody knows she has gone there except those involved in the murders! What follows is pure insanity; disfigurement, bird attacks, underground lairs and murders abound! Will Barbara discover who the real killer is? And will she find her sister alive or dead? Only those that have seen this rare title know the answer to that one!