(My wife downloaded the Kindle App to her Blackberry and now she is reading Gerritsen as well.)
The Surgeon (2001) introduced Detective Jane Rizzoli, and The Apprentice (2002) introduced Medical Examiner Dr. Maura Isles. Since then there have been seven novels featuring Rizzoli and Isles, with the 2011 publication of The Silent Girl, being the most recent as of this writing.
Gerritsen had written previous successful books, the most notable was The Bone Garden (2007) which is set in 1830's Boston. However, none of her previous work found the large audience of the Rizzoli and Isles novels. Interestingly, I think, Jane Rizzoli was not the primary character in the first novel, but with the TV series, and Angie Harmon, Rizzoli has now become the focus of the television program, while Dr. Maura Isles is still the main character in the novels.