The novel revolves around Sonia, a seemingly ordinary woman living in a house by the river Thames, who becomes dangerously obsessed with a teenage boy named Jez. When Jez visits her home, Sonia impulsively decides to hold him captive, driven by a mix of nostalgia and unresolved trauma from her past. As the days pass, Sonia's grip on reality begins to unravel, revealing the depths of her psychological turmoil and the impact of her past relationships. The story explores themes of obsession, memory, and the fine line between love and possession, building tension as Sonia's actions spiral out of control.