Determination

In The lovely Bones, Susie Salmon watches her family from above and narrates the novel from heaven. Susie's killer walks the street for many years being unknown to be a serial killer. George Harvey clearly has no quilt for what he has done to many girls and feels no sympathy towards the families of his victims. Although he plays his part very well in acting sympathetic and not being suspicious of anything, he eventually is discovered as being the killer of many many victims in various places.
Susie watches from above as Mr. Harvey walks the streets and no one knows what he has done. Susie becomes determined to help her family by giving them clues and signs that he infact was her murderer. Her father and sister do not give up to prove that he was the awful cold hearted man that killed young Susie. Susie is still present in their house and they can feel her still there. Her father especially can feel her still with him and knows that he will not give up until her proves Mr. Harvey guilty.
Susie not only gives feelings towards her family members but also to Ruth and Ray, they can feel her with them as well. In fact when Mr.Harvey puts her body in the sink hole Susie's spirit goes into Ruth's and Ray becomes aware of this. She points to the safe while in Ruth's body and just as Mr. Harvey goes to dump it in he senses that someones watching him and turns to see Ruth and Ray focusing in on him. He realizes that they know what was in the safe and throws it in.
When Susie's father finally proves that Mr.Harvey was guilty,with Lindsay's help, and the police find clues and link him to another young girls murder years ago, they begin the search to look for him.
Before the police catch Mr. Harvey he falls down an ice hill and dies from injuries.
Before I Fall doesn't have anything to do with the family trying to solve a murder, it has to do with Sam, trying to figure out why it was her who deserved to die. She gets to relive this day over and over again and each day she relives is different in some way. Her discovery isn't to prove someone different it's more a journey of self discovery and a realization of who she was becoming.