"Snuff" (Discworld series 39) by Terry Pratchett has double meanings: extinguish (candle, life) or tobacco to sniff (cause sneeze). Serious issues, humanity and sorcery, are tackled with humor. Commander (and reluctant Lord) Sam Vimes, arrives with family for holiday at his wife Sybil's country estate, and senses evil afoot. Amid son Sam's silly pre-occupation with poo, encouraged by meeting his favorite author Miss Beedle, are base crimes: kidnapping, murder. But the submissive goblin class are treated as vermin, without legal status. Their unggue religion creates beautiful pots to store bodily wastes, even nail-clippings, but not teeth.
The power of such preserves is more believable after reading Witches and Magic-makers by Douglas Hill. Photographs from ancient artifacts to present day markets, across the Americas, Africa, Asia, illustrate long-standing and existing beliefs. We may wonder why, but people do accept unreal facts.
The writing style is cobwebby complicated and repetitive (to me). After many Discworld books, the author has many details to keep track of and incorporate. I hope the Alzheimer disorder does not worsen and deteriorate the quality, like Agatha Christie's work suffered by her last.

Spoilers:
Jiminy bar-keeper and retired Colonel Rust try to warn off the newcomer. Sam finds a brutally killed goblin girl, source of copious blood, evidence for the corrupt local council to mislead their village inspector. Young Feeney arrests Sam, who recently publicly vanquished quarrelsome blacksmith Jethro, now vanished.
Meanwhile city watchmen Carrot and Angua search suspiciously wealthy cigar factories. Sergeant Colon starts acting goblin-like after he grips and cannot release a miniscule goblin jar in a cigar from Bewilderforce Gumption. Blue Feegle Wee Mad Arthur flies to Howandaland wilderness to investigate reports on mass evacuations of unwilling goblins.
Miss Beedle's best student, Tears of the Mushroom, has a heavenly hand at the harp, like the victim did. Lady Sybil can invite movers and shakers to a soiree. Can music change society perception of goblin humanity?