Horror on the Ruby X — Frances Crane

During a blizzard, a New Mexico ranch hosts “a poisonous lady of the manor . . . a puritanical spinster, an alluring secretary, and a succession of violent deaths” (Kirkus Reviews).
 
While investigating a deadly automobile accident in New Mexico, Pat and Jean Abbott are trapped at the Ruby X Ranch by an unexpected snowstorm, along with the ranch owner and his family, the local sheriff, a pretty secretary, and a Navajo chauffeur. But not all of them will survive the night, and when the private investigator and his wife try to identify the killer in their midst, they find themselves frozen out . . .
 
Praise for the Pat and Jean Abbott Mysteries
“One of the more interesting married teams of detectives . . . A sort of globetrotting Nick and Nora.” -- Thrilling Detective
 
“Pleasant reading.” -- The New York Times
 
“[A] lively, well-plotted and mystifying case.” -- Saturday Review