I am confused about the Kesselman characters (mother and son). When a female voice spoke to Ragle on the phone, reminding him about attending his first civil defence class, she said that Walter could drive him to/from the class to save time, being a 15 minute car journey away. I am assuming this voice was Mrs Keitelbein (as this identity was used by a female who called at Ragle's house in person about joining the CD class), but Mrs Keitelbein only lived a block away, and it was more likely that Mrs Kesselman lived a 15 minute car journey away, because he had driven to her house (on the hill) before. It's as if during that phone call, Mrs Kesselman momentarily forgot (and so made a mistake) about maintaining her alter ego identity of "Mrs Keitelbein".
If this is correct, then why was the book written that way? Why does the book seem to purposefully confuse these two identites, as if to merge them together for some reason, so that they become one identity? (Mr Black mentions to Lowery that he knows someone called Mrs Kesselman, so a person by the name of Kesselman does seem to exist.)
The thing that puzzles me is if there is only one identity, and Mrs Kesselman had created an alter ego (Mrs Keitelbein) in order to sidestep Mr Black and the city authorities (as she was an "undercover lunatic"), then why did the Kesselmans sidestep Ragle in her house on the hill, by escaping from the locked closet, and presumably, alerting the city authorities to Ragle's current location, as he was quickly overcome by a group of city workers?