Ordeal by Innocence

This is an extract from Ordeal by Innocence by Agatha Christie 

Jacko Arglye dies in prison, convicted of murdering his adoptive mother Rachel Argyle. Arthur Calgary, an absent witness in the original case, comes forward providing Jacko with an alibi and clearing his name. Suspicions are then raised about the other members of the household. In this scene, Calgary meets with Dr MacMaster to learn more about Jacko and Rachel Argyle.