A fellow reference librarian recently recommended the first book in the Scottish mystery series by A.D. Scott, A small death in the great glen (Atria Books, 2010). The story is set in the Scottish Highlands in the mid-1950s, and the main characters are the staff of a small weekly newspaper, the Highland Gazette. Unexpectedly, they have the death (possibly accidental) of a six-year-old local boy to deal with. I expected--and got--an absorbing mystery story, but I also got a glimpse into Scottish Halloween customs.
As the month of October progresses, the townspeople, both young and old, devise costumes for the purpose of "guising," or dressing up in a disguise for party-going or trick-or-treating. Children carve faces into turnips rather than pumpkins and, at a party, treacle scones are suspended on strings from a clothesline and "hands behind backs, mouths open like baby cuckoos, the children would try to bite through a scone as it swayed in front of them. Invariably a passing prankster would jerk the rope, sending the treacle-soaked scones slap into someone's face or hair or down the back of a neck, to shrieks and taunts of "I got you, I got you!" (p. 206).
*Currently on order.
Definition of dreich from http://caledonianmercury.com/
Caledonian Mercury word list: http://caledonianmercury.com/
Turnip photo: http://oblatesosbbelmont.org/2014/10/31/carving-the-turnip/