Betrayal of Trust, by J.A. Jance

Beaumont and his wife Mel are asked to investigate the Washington State governor's step-grandson's activities when the governor finds an apparent snuff video on the kid's cell phone.

From that, the case explodes into the death of the boy, the death of the girl in the video, the intermixture of the rich and poor at a teenage sort-of-halfway-house, and politics. Not a strong plot, but the characters are so well-drawn that it feels like more than it is. And I do like Beau, even as he gets old and creaky and his knees get more and more painful. Oh, and he gets to meet his father's side of the family finally, too.