Revenge is his game, and Black Hemlock is willing to do anything to settle the score. For years, Black Hemlock has been biding his time, sulking that bragging rights to a long ago cyber heist was snatched from him. Throw in betrayal and a broken heart, and he has the perfect motive for murder. Once more True Detective Agency is called in to assist in finding the perpetrator, this time using Carson as bait. Fearless and capable, Carson has no problem going head-to-head with a killer with a penchant for poison. As the trio delves into the lives and deaths of the victims, a buried secret could destroy them all.