It all began with a sharp rap at the door Tuesday afternoon.
Joan (not her real name) was in her living room, on Prince Street near Ashby BART, getting ready to work on her taxes. Financial documents were spread out all around her.
When she opened the door, a young man in his 20s, wearing a tam o’ shanter, said he had been up the street on a rooftop when he noticed a raccoon on her roof…