Showing No Holiday for Crime by Dell Shannon

There's no holiday from crime at the Los Angeles Police Department, not even at Christmas. Among a string of bizarre cases, there's the very mysterious killing of Lila Askell, the young devout Mormon who was on her way home for Christmas but is found strangled and thrown out of a car.

As the Christmas trees are being decorated and the presents wrapped, Lieutenant Luis Mendoza has one of his toughest cases on his hands...