False Faces — Seth Margolis

A cop goes undercover to investigate the murder of a woman on New York's Fire Island: “A good yarn populated with well-drawn characters” (Booklist).
 
Alison, a young, single Manhattan retail buyer, first met Linda seven years ago, when both answered the same classified ad for a Fire Island share. Since then, they've been returning to Seaside Harbor every summer weekend.
 
But one night, after leaving Crane's, a famed singles bar, Linda is found murdered, and Alison starts to realize how little she really knows about her housemate. Is the killer a spurned suitor? What about the mysterious lover back in the city Linda had spoken of -- but whom Alison has never met?
 
Meanwhile, Long Island police officer Joe DiGregorio has been assigned to work undercover on the case, posing as a yuppie accountant. Together, Joe and Alison -- who is unaware of Joe's real identity -- are about to unravel Linda's many secrets . . .
 
“With refreshing insight, Margolis conveys the intensity and the crass materialism that are the hallmarks of a certain breed of young professionals.” -- Publishers Weekly