Kaspar, a 38-year-old X-ray technician, lives a solitary life in a Hollywood basement. His world shatters when he discovers his own terminal cancer diagnosis. This prompts him to reconnect with his past, haunted by a childhood memory as a pool boy, when life felt simpler. Fixating on a pool as a symbol of lost joy, he trespasses into an empty house, rekindling his old passion. But his quest turns dark, leading to a physical and emotional collapse. Poolboy is a darkly comic exploration of life's fragile beauty.