Masquerade — Walter Satterthwait

In an elegant Paris hotel room, the carpet was white, the bed, covers white, and the blood of dilettante Richard Forsythe and his German mistress a ghastly touch of red. Noting the lingering traces of lovemaking and the door bolted from within, the police ruled the shootings a romantic suicide pact. But Phil Beaumont, rugged Pinkerton agent, and Jane Turner, novice "op" disguised as a nanny, were looking for evidence of murder.

Now, from the famous sewers of Paris to its gilded salons, Phil and Jane enter a decadent world that is more dizzying than champagne, more dangerous than cocaine. And among the Lost Generation--jazz singers, artists, Hemingway, Picasso, Alice B. Toklas, and Gertrude Stein--they begin to unmask the secrets of sex and politics that lead to despair, desperate acts...and perhaps their own demise.