Reluctant New York City private eye P.J. Detweiler is hired as a bodyguard to protect Maureen Preble, the mistress of shady millionaire William Orbison. In truth, Orbison plans a deadly intrigue in which P.J. is to play a central part. Meanwhile, complications ensue as P.J. gradually falls in love with Maureen.

Little coastal town is being terrorized by deadly Barracudas.

比尔-科特内博士是个成功的科学家，他有一个漂亮的未婚妻叫詹-康普顿。在一次严重的车祸中比尔的未婚妻身首异处，比尔博士闻讯后他将詹的头带回实验室，依靠一种液体来维持未婚妻的生命。