Conventional Caroline, engaged and living with her father, has an unnerving link with her twin sister sister Lisa, a hard-drinking high class call girl living in London. After a terrible vision that Lisa is dying, Caroline flies to England to find that her sister is already dead.

Taking it upon herself to investigate the mysterious death Caroline submerges herself in Lisa's persona and inhabits the murky depth of London, plagued by distorted dreams and attempting to avoid her fiance who arrives to take her back home...