I am a little puzzled about the motivation....I understand that Brody felt Anna was the reincarnation of a woman Brody knew (who was not yet dead). That being said, why did they decide to take Anna? In the hopes she would grow into this woman? Or, more likely, was Brody simply a pedophile who used his influence over Waters to abduct a beautiful young child? As I read the details, Anna could not have been in the possession of the two for long, not without being detected. If Anna were kept alive, where could she have been? Passed off to someone else for safekeeping? Did Brody have any other known associates (or "followers")? Besides the place where the two stayed, did Waters maintain a residence elsewhere? Somewhere he may have stayed following the seperation but before becoming Brody's "roommate"?
Is anything known of Brody's past? Criminal history? Former associates or residences?
Were dogs ever brought in to aid in the search for Anna along the stream? The map Dr. Doogie supplied is a little difficult for me to read, but by Mapquesting it appears the stream empties into the bay. At the time Anna disappeared, given the massive amount of rain that had fallen, was the stream high enough to bypass any normal obstacles (dams, tree roots, etc)? Having two children myself, I know the fascination the young have for moving water. Did Anna normally play in or near this stream on more normal days?