And When She Was Good by Laura Lippman

Heloise has managed to put an abusive childhood and seedy early adult life behind her by moving to the suburbs with her son, Scott.  She runs an elite escort agency, but has created covers as a lobbyist and owner of a few online businesses. Having a client who's a politician (Paul) and a longtime friend (Tom) who's a cop has also helped her keep her background hidden.  However, things start to unravel--a fellow madam dies, Tom warns her to be extra careful, and one of her girls decides to blackmail her.  Heloise finds herself more uneasy than ever and wonders how she'll be able to extricate herself from this mess and keep her son safe.  Told in chapters alternating between her teen years/recent past and the present, And When She Was Good was a book I had a hard time putting down.  Lippman did a great job creating a character and story that the reader becomes immersed in.