Through an open street drain, Gary Strange overhears the devastating story of JJ, a double bass-playing, drug-taking, sex-fuelled firecracker of a woman who keeps taking the wrong turns in life.

Long-time dweller of the London sewer system, Gary Strange has discovered a unique way to become intimate with his high-rise neighbours: listening to their innermost secrets through plug holes, drainpipes and washing machine fittings. They all have one thing in common - they are desperate for connection. Join Gary amongst the fatbergs and flushed pets as he basks in the joy of filth, encountering stories of bad sex, sad sex and even clown sex.