A skull with obvious signs of foul play is dug up in a garden, bringing to the surface a mystery dating the back to the 1830's.
The story flashes back from modern times as our protagonist attempts to solve the century and a half old mystery back to 1830's Boston as the crime is committed.
I really enjoyed this book. The only bad thing I have to say about it is that it doesn't appear Ms. Gerritsen has written anything else quite like it. More, Ms. Gerritsen, more!