Robert changes his identity to "Martin Field" and moves in with the Herricks at the estate which he is now owner of. When Herbert finds out about Robert's return he makes a futile attempt to blackmail him too, and out of pity - and perhaps thankfulness - Robert pays the man one thousand pounds to get rid of him. Robert has one condition for paying the money: that Herbert kills the doctor's dog Brutus, who has followed Robert back to the Herrick estate after the fire. Robert starts losing his visibility one day at the breakfast table, with Julie and her fiancé Mark present. He tricks Mark to follow him down into the wine cellar, where he knocks the man out, starting another, second blood transfusion with Mark's blood. Chief Constable Travers arrives at the estate after he has found out about Robert's return. With some help from Herbert and Jasper they break into the cellar just as the transfusion is about to be completed, in time to save Mark's life. Robert is attacked by the still very much alive Brutus, and killed. Mark tells the others that Griffin went insane when he was locked up in the asylum, and meant no one any harm until he escaped.