I'd like to know what exactly she was asked to do in each home and whether this was the 'going rate' for this type of work. I wonder if he kidnapped her simply because she was an easy target (working for him and trusting enough because of this to meet with him alone) or he targeted her specifically. If he targeted her maybe the $500 per house was supposed to be too good for her to turn down and this was his plan all along.
I also have to wonder whether he expected Charlie to visit with KB that day. Did he want to kill Charlie so that the one person who most likely knew KB went to meet him could not alert the police when she went missing? Or was it a surprise Charlie turned up.
It is such a horrifying thing to happen to anyone. I feel physically sick looking at where KB was kept (from the pictures posted here). Nothing could make the world feel safe again, I hope she has all the support there is to help her rebuild her life.