Detective Jack "Mac" McCrae has lost his hero. Without children or any family, the retired detective takes the death of his mentor hard. When the man's son reaches out to Mac with a mysterious letter containing a startling confession, asking for his help, Mac finds he can't say no.

He interprets the cryptic letter and begins to search for answers. Who did his hero wrong? And why?
Mac's investigation reveals a decades-old case in which a bad man was sent to prison. But was it right or wrong? Just or corrupt? And regardless of the answers to those questions, a larger one looms — what to do now?
Mac discovers that some answers can lead to harder questions... and at times, this life requires even more from us.