McMillan "Mick" Sentry, a writer living in Spring Falls, determines to give justice a hand through incisive investigation, cool tech, and physical persuasion, becoming the vigilante detective the Knight Shade. Although initially a person of interest himself when thrown into his first case, the vigilante detective ultimately works with authorities to find the link among the murdered victims and identify the culprit. A man convicted wrongly 20 years ago and recently released from prison harbors a bloody grudge against those who framed him, until the trail veers off and the fourth intended victim has no direct connection, making the motive a crucial element in solving the crimes.