When one of Regan's snouts complains that his girlfriend's recent suicide was murder, the flying squad detective feels compelled to investigate. He uncovers a conspiracy that reaches the heart of the government, and finds himself fitted up, suspended and under the scrutiny of Special Branch.

Henry Jekyll is a troubled man. His wife died of pneumonia. He wants his sister-in-law, but her father forbids any contact. And his experiments into the dual nature of man have yielded a personality-splitting drug that he has tested on himself, changing him into an uninhibited brute who seeks violent and undignified pleasures. Jekyll quickly becomes addicted to the sordid freedom induced by the drug. He can commit the most enjoyably revolting deeds, then return to his laboratory and use an antidote to change back to his original form, so that his lofty persona remains untarnished.

A struggling pulp fiction writer who doubles as an incompetent jewel thief. He gets caught in the act every time, but he uses his looks and charm to make the best of it. Soon he becomes a celebrity. Wealthy women start leaving their jewels out like milk and cookies for Santa Claus in hopes that the sex thief will unlawfully invade their domiciles.

Jamie McGregor is a virginal sixth-former in suburbia delivering groceries for the local supermarket, but he is more interested in other matters - Mary, Linda, Paula, and Caroline. He tries to seduce the girls of his dreams in the swinging sixties.