Here Comes Santa Clause, Bill Pronzini
by Patti Abbott
#111 (more or less) PA
The Nameless Detective is persuaded to play Santa at a charity affair. When a nasty nine-year old gives him a hard time, he threatens to stuff his pillow down his throat. His father, who comes forward with righteous indignation, turns out to be a guy Nameless put away. His son seems to take after his Dad as various charity attendees come up with things missing.