The Last Mile (Amos Decker series)

After spending the last 20 years in prison for killing his parents, convicted murderer Melvin Mars suddenly learns that he will be released. Another man has unexpectedly confessed to the crime. But it's unclear who the real murderer is--was the man's confession false? Is Melvin still the true killer? Meanwhile, Amos Decker is settling in to his new job at the FBI. He becomes interested in the Melvin Mars case after reading about it online. He's struck by the similarities to his own case, and begins conducting his own investigation in his spare time. As he digs deeper, Decker realizes that the case is much more complex than it first appeared. He is shocked to discover unexpected connections to the highest levels of power...