People are dropping like flies in Dr. Emma Steele's ER. Nobody knows why. A new disease? Medication errors? Poisoned oxygen? She must find out, even though her job is in peril, her daughter disappeared, and she'd rather be home, drinking wine.

Is it a mercy killer? But why kill a healthy patient? Is somebody framing her nurses? Or framing her?

More strange things happen. A patient's death by stolen medications, her orders corrupted by lethal mistakes, her nurse killed. What happens to her daughter is worse than death.

Dr. Steele risks her career and her life to stop the murders. She gets closer and closer to the answers. Until she gets too close.