Robert B. Parker 
Widening Gyre (A Spenser Mystery) [EPUB ebook] 

The adoring wife of a senatorial candidate has a smile as sweet as candy and dots her i’s with little hearts. A blonde beauty, she is the perfect mate for an ambitious politician, but she has a little problem with sex and drugs — a problem someone has put on videotape.The big boys reckon a little blackmail will put her husband out of the race … until Spenser hops on the candidate’s bandwagon.But getting back the tape of the lady’s indiscretions is a non-stop express ride to trouble — trouble that is deep, wide and deadly.’One of the great series in the history of the American detective story’ New York Times