Teresa, a cabaret star, has to leave her work due to the death of her father. She decides to go to the small village where he lived to meet her brother, Miguel, who is going to marry Marisol soon. Teresa begins to feel attracted to Miguel, and tries to seduce him

Córdoba, Spain. Lord Killarney, representative of the British Museum, acquires an Arabic incunabulum at an auction; but he is murdered and the book disappears. All suspicions fall on El Lince, an antique dealer with a shady background, who asks his nephew to warn Curro Jiménez.

Angelo Russo, a sixteen year-old girl, is found dead in a river, having been fatally violated with a large blunt instrument. Inspector Di Salvo is assigned to the case and focuses his investigations on St. Theresa's, the exclusive school where Angelo boarded. Three of the murdered girl's classmates, Franca, Paola and Virgina (who call themselves "The Inseparables"), receive threatening poems from an individual using the name "Nemesis". Bizarre "accidents" start to befall the girls: Franca is injured when someone causes her horse to bolt and Virgina nearly breaks her neck on marbles left at the top of a staircase. But Di Salvo is determined to find the killer, even if it means using unorthodox methods. He is aided by Angelo Russo's little sister Emily, whose helpful clues lead to a boutique owned by a dubious character and a vice ring where "rich influential men pay well for teenage favours" ...