This is the 10th book in the Spenser series.
Spenser is hired as a guard on the U.S. Senate campaign of ultra-Christian Meade Alexander. He soon finds out that Alexander is being blackmailed with the threat of making public a video of his wife in bed with a young man. Alexander truly loves his wife and would rather give up his political aspirations than humiliate her.
Susan is in the midst of a one-year internship in Washington D.C. for her Ph.D. Spenser goes to D.C. on his case and finds Susan different in significant ways. "Her face was as it had always been: intricate, beautiful, expressive. In the last year somehow it had also become faintly remote, as if always she were listening to a whisper, barely audible, from someplace else: her name, maybe, tiny and hushed."
Spenser is also very sensitive concerning the middle-aged women he sees having sex with four "college boys" who are secretly taping the rendesvous. "These women were real, with the fine roughening of skin here and there, the tiny sag at the breast, the small folds across the stomach that real women, and men, have. . . . That kind of vulnerability shouldn't be handed around. It was for someone who loved you and was vulnerable too."