Great letter - wonderful last line. Good for him! Honestly!
Sorry, but while "creepy" was her vernacular, and not "SP" for "suspicious person", it's hard to fault her for trying to protect the neighborhood.
Perhaps she watches all the child abduction shows on the ID channel or Mariska Hargitay's show?
Being that it's not only MA, but Cambridge, MA to boot, he must have really freaked her out.
I seem to remember a young boy was kidnapped in Cambridge (1990s) a la Leopold & Loeb (two gay males), and eventually murdered by stuffing a gasoline soaked rag in his mouth.