American Quartet ($5.56 Kindle), by Warren Adler, the first in his Fiona FitzGerald Mystery series.Book Description
Never underestimate the power of failure In this first book of the Fiona series, four seemingly unconnected D.C. murders stimulate Fiona FitzGerald's sense of history as she delves into our country's dark past. In her search to solve the crimes, she uncovers the disturbing sexual and homicidal obsessions of a socially prominent but failed Washington politician.
To get it free, search for the title in the Sony Ebook Store using the desktop Sony Reader software (it's a free download; with it, you can read books on your PC even if you don't have a Sony Reader).
Update: If you have the sony reader (or don't mind reading on your PC) and like this book, Sony is running a promotion on a bundle of six books in this series for $19.99: Fiona Fitzgerald Series Bundle. This contains the following titles (which are $5.56 each in the Kindle store or $6.60 each from Sony):
Senator Love
Immaculate Deception
The Witch of Watergate
The Ties That Bind
American Sextet
Death of a Washington Madame
