Ordeal by Innocence, Christie, Agatha

According to the courts, Jacko Argyte bludgeoned his mother to death with a poker. The sentence was life Imprisonment. But when Dr Arthur Calgary arrives with the proof that confirms Jacko’s innocence, it is too late — Jacko died behind bars following a bout of pneumonia. Worse still, the doctor’s revelations reopen old wounds in the family, increasing the likelihood that the real murderer could strike again…