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This novel has definitely some DuMaurier vibes.
An old house in Cornwall - check
A slightly creepy female servant - check
A family secret - check
A dreary and atmospheric setting - check
I was planning to read this book for the New Release square, but since this novel has the Magpie nursery rhyme at its core and a lot of superstition is at work (the main character is a psychic who tells the future out of tarot cards), I will be reading this novel for this square: