The Bone Garden: Tess Gerritsen

I am not sure how this fits into the Rizzoli and Isles series, Isles was literally mentioned in one chapter and had a short conversation. The story was a cross between a historical novel and a romance, with the idea of reincarnation thrown in unessessarly. A newly divorced woman moves into a new house and finds bones in her garden- now unless I missed something, it never goes into who and why those bones are there- since the woman was murdered. The new house owner meets the previous house owner's relative and they find out about the house builder's history through letters. We also never find out if the previous owner's death was natural or murder- so there are two unfinished story lines and a bunch of unnessary stuff instead. I think this will be the last book of hers I read...