They trusted her. That was the last mistake they ever made. "Aem Cyanide" sat across from her victims, watched them eat, watched them drink, watched them die. Then she took everything they had. At least 14 dead, their bodies drained of life, their accounts drained of money.

For years, she operated in plain sight across Thailand, exploiting intimacy as a murder weapon in the most unprecedented killing spree in Thai history. Then one investigator saw what nobody else could. What followed was a frantic race against time to stop a predator who was actively hunting.

Through unparalleled access to investigators, devastated families, forensic experts, and Aem's own defence lawyer, this series plunges into the manhunt, the forensic breakthroughs, and the systemic failures that let a serial killer walk free for years. Each episode peels back another layer of manipulation, missed warnings, and the devastation left in her wake. The closer you look, the darker it gets.