Peggy Carr and two of her sons are rushed to hospital with extreme pain and nausea. Doctors are initially baffled by the trio's symptoms but when they test positive for a rare and deadly poison, detectives launch an investigation. Forensics indicates someone has tampered with bottles of coke in the Carr family home. Peggy dies in hospital, and Detective Susan Goreck goes undercover to find the killer - with the investigation, and her life, on the line.