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A homicide has eerily similar circumstances to a murder that occurred months prior. When detectives find that the current victim is the third who died in an identical manner, the evidence points to a serial killer, and the method of murder suggests that the assassin has medical knowledge. As the investigation moves forward, the investigators learn that each of the murder victims had escaped prosecution for a child-involved crime. Now detectives are looking for a vigilante, and the killer isn't the only one who believes the murders are justified.

When detectives find a link between the victims and the local hospital, it doesn’t take long for some details of the investigation to become common knowledge. Married to Julie, a surgeon at the hospital, Devon often relies on his wife as a sounding board, and in this case, counts on her to provide information that could lead to the killer.

Torn between his belief in the law and the demand for justice, Devon has to decide which is of more value. When the legal system fails, should justice be ignored? If a murderer is killed, is the executioner a criminal or a hero?