Sergeant Sniff's Christmas Surprise A Sergeant Sniff ScratchAndSniff Mystery - Sergeant Sniff Scratch-and-Sniff Mystery Author:Valerie Garfield How do you solve a mystery? Sergeant Sniff sniffs, and she follows her nose! Sergeant Sniff knows she can't open the present under the tree before Christmas Day, but nobody said anything about sniffing out the mystery of what's inside! Children will delight in scratching and sniffing the clues as Sergeant Sniff follows her nose.