** spoiler alert ** 
 Quick read. Creeped me out... different from the other rizzoli and isles. I didn't know where it was going for a long time. Certainly couldn't have guessed the resolution. But so glad Maura finally broke it off with Daniel! And any guy Maura becomes interested in is either evil or die a quick death. 
 Hope she can find love! 
 So I guess Doug, Elaine and Grace died because the contractors or the old guy killed them. I just know they ended up at the bottom of the ravine.