Another thought that I have had: I liked the way in which du Maurier demonstrated the way in which the drug increased its grip on Dick. In Chapter 7 he started confusing the present and the past, thinking he needed to clean out bowls following the death of Sir Henry.
Then more dangerously he told Bill about seeing Otto Bodrugan being drowned. Again, at the inquest he referred to the snow in giving his evidence, and it was on the day of the inquest that his fingers were numb and he dropped first his razor and then his coffee cup.
Most frighteningly, he returned to the past without taking another dose of the drug, and it was at the end of that episode that he physically attacked Vita, thinking she was Joanna.
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