The 24th Letter (Sean O'Brien)

A priest hears the confession of a frightened prison inmate, and he learns that a man facing lethal injection in 84 hours is innocent. The lead investigator on the high-profile case was his old friend Sean O’Brien. And now O'Brien has a chance to right a horrible wrong. But he has less than 84 hours to uncover clues to a crime that sent an innocent man to death row.

Appeals have expired and the man will be executed in unless O’Brien can find evidence that points to the real killer. The 24th letter in the Greek alphabet—Omega—may provide the key to uncovering the killer’s identity.

Evidence may not lie, but evil does, and when the original killer comes out of his lair, O'Brien is in a race to save two lives - the man on death row and his own.