The Lovely Bones by Alice Sebold

What I would like to know is more about Mr. Harvey. Why did he want Susie? Did he attack more girls? How long did it take him to prepare for this? Did he plan on killing her? Does he feel guilty? How did he know that she was going to take the shortcut that day? I bet that it would have happened eventually though. He created a big den underground with cokes and lights. So he had to have been planning this forever. Is there any evidence that can be held against him? I think its going to have something to do with her charm bracelet. Susie said that her mom knew about all the charms on her bracelet.