The Wilder Parts of the Forest

From the introduction:

Mr. Armitage, one of the Wardens of The Wilder Parts of the Forest. Mr. Armitage is a faun, having the body of a man, but the legs and tale of a goat and two horns on his forehead, one of which is snapped off two inches before the tip. Armitage served the Usurper as a spy and kidnapper during the occupation, which still haunts him to this day. His source of strength comes from his need to assuage his guilt; his experiences during the occupation have left him a morose but dutiful alcoholic. Armitage has been tasked with solving the disappearance of Edwin and Ruan Goodis, a badger prospector and his young son, missing from their home for over a week.