When 17 year old Joanna comes to Swinging London, she meets a host of colourful characters, discovers the pleasures of casual sex and falls in love. That's when things get complicated.

The eccentric professor Collins lives completely secluded in his chaotic apartment. When the model Penny moves in next to him, he becomes fascinated by her. He drills holes in her walls and ceiling and peeps on her day and night. He loses himself in daydreams and delusions.