A gunman holds up a record shop, taking young student Gracie and store owner Frank Morris hostage. When a sudden heart attack strikes and a police stakeout, led by Detective Lieutenant Palmer, unfolds, Dr. Simon Locke finds himself inside the store. Meanwhile, Hayes devises a desperate escape plan.
Dr. Locke provides a medical clue to aid skeptical Det. Lt. Dan Palmer in a challenging effort to capture a mad bomber before she or he strikes again.
A police sergeant named Joe Platt assaults Dr. Locke and steals ten kilos of heroin. This occurs after Platt ambushes a police stakeout aimed at a major drug smuggling operation at the waterfront. In response, Dr. Locke launches an investigation, following clues that lead him to a troubled woman connected to a mysterious conflict.
After Dr. Locke is injured in a car crash, a homeless man steals vials of a deadly drug from his car. This homeless man then becomes a victim of young drug dealers. The only witness to the theft is a temperamental invalid named Nina Foch, who holds the key to preventing the confined panic from escalating into a public emergency.
Andrea Warren receives a series of anonymous calls that threaten the life of her close friend, Dr. Locke.
Dr. Locke engages in a perilous investigation after discovering why his esteemed former medical professor, (Leo Leydon) shot an intruder and let him die. His inquiries raise suspicions of blackmail.
