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Summary

Heroine's mother was evacuated from London to countryside in WWII. Daughter didnt find out about this until a lost letter arrives in 90's and mother is very upset about it. Daughter tours castle where mother stayed for short time. All 3 sisters still living, twins are oldest and younger daughter may have dementia or mental instability. Their father was author of a loved children's book, probably a YA book, as it was rather a horror story. Mud Man was the scary character, which figures into the plot.