Christmas in Dodge City by Benjamin M. Schutz
by Barb Goffman
From D.C. Noir 2: The Classics (Akashic Books, 2008), originally published in Unusual Suspects, (Vintage, 1996).
A mother searches for her missing good child; a homicide detective tries to catch a killer; and the missing good child tries to kill the killer (for reasons that either aren’t clear or I don’t recall). All three stories intersect.