Thin Air (Parker novel)

Thin Air is the 22nd Spenser novel by Robert B. Parker. The story follows Boston-based PI 
Spenser as he searches for the wife of his longtime associate, Sgt. Frank Belson of the Boston Police Department.
Plot.
Belson returns home one night to find his young wife, Lisa, missing, with no clue as to her whereabouts. He suspected that she may have left him, but circumstances seem to indicate she was kidnapped. Shortly after confiding in Spenser, Belson is shot returning home one night. Since he is unable to search for her himself as he is hospitalized, Spenser undertakes the search himself.
The investigation leads him to the impoverished town of Proctor where he has to uncover details of Lisa's life previous to meeting Belson to discover where she might be now.
Writing style.
This novel is a bit different from all other Spenser novels as it tells the story concurrently not only from Spenser's point of view, but also from Lisa St. Claire's. This is a departure from every other previous Spenser novel.
In other media.
The novel was made into a 2000 TV movie, starring Joe Mantegna as Spenser.