<P>While serving a sentence for killing his foster mother -- a crime he insisted he didn't commit -- Jacko Argyle dies in prison. Two years later, the man who could have supported Jacko's alibi suddenly turns up.</P><P></P><P>Recovering from amnesia, Dr. Arthur Calgary discovers what happened in his mental absence -- and that he alone could have provided an alibi in a scandalous murder trial that ended in the conviction of Jacko Argyle for killing his mother. </P><P></P><P>But the young man's innocence means that someone else killed the Argyle matriarch, and that person would certainly kill again to remain in the shadows.</P>