Ordeal by innocence

According to the courts, Jacko Argyle 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 re-open old wounds in the family, increasing the likelihood that the real murderer could strike again... "Family tensions and suspicions are adroitly handled, and the solution is characteristically surprising." - New York Times