Redemption by David Baldacci

Amos Decker is visiting the graves of his wife and daughter when a man he helped put in jail for life without parole comes up to him and asks Amos to clear his name.  He has terminal cancer and only days to live.  He’s been let out of prison because the system does not want to pay for his health expenses.  That evening someone kills the man.  Decker decides to look into it against direct orders from the FBI.  The only people to talk to are the wife of one of the original murder victims and the man’s daughter.  But as Decker picks at the lives of these people from thirteen years ago,it seems like everyone Decker talks to ends up murdered.  And the real secrets behind it all is almost unbelievable.