In Greek mythology, sirens (Ancient Greek: singular: Σειρήν, Seirḗn; plural: Σειρῆνες, Seirênes) are humanlike beings with alluring voices; they appear in a scene in the Odyssey in which Odysseus saves his crew's lives. Roman poets place them on some small islands called Sirenum scopuli. In some later, rationalized traditions, the literal geography of the "flowery" island of Anthemoessa, or Anthemusa, is fixed: sometimes on Cape Pelorum and at others in the islands known as the Sirenuse, near Paestum, or in Capreae. All such locations were surrounded by cliffs and rocks. Sirens continued to be used as a symbol for the dangerous temptation embodied by women regularly throughout Christian art of the medieval era. "Siren" can also be used as a slang term for a woman considered both very attractive and dangerous.
Police constables Ted Vetter and Robert Farnham are working the night shift at a small station in the London suburb of Crouch End. They discuss the case of Doris Freeman, a young American woman who came in to report the disappearance of her husband, lawyer Lonnie Freeman. Nearly hysterical, Doris arrived in the station speaking of monsters and supernatural occurrences.
