Police detective Lucas has become consumed with tracking down the deranged killer, known as Mechanic, and bringing the murderer to justice. Nothing else matters, not even his wife. His marriage is falling apart. Mechanic has not killed for eight months and the trail has gone cold, then Lucas receives a terrifying letter. In a desperate bid to reignite the case, he tries to convince his boss to mount an operation in Baton Rouge where the letter was posted. But was the letter really sent by Mechanic? Not knowing where to turn, with his marriage in turmoil and his career on the rocks, Lucas begins to spiral out of control and when Mechanic meets the head of a drug smuggling cartel the situation takes a grave turn Meanwhile, a bizarre set of murders are taking place in Vegas and Detective Rebecca Moran is put on the case. She will stop at nothing to make a name for herself. Is there a link between the murders and Mechanic? Can Lucas apprehend the killer this time or will Mechanic remain one step ahead?