there were not many people in the park other than him due to the cold weather - that is, other than the girl in the [red] coat.
"excuse me, i was wondering if you'd seen a book around here, leaves of grass, as i seem to have misplaced it," she said.
he smiled sheepishly and held up the battered paperback he was reading, explaining that he intended to try and find its owner.
she laughed and took the book back - he expected her to leave then, but instead she sat down beside him and they spent a delightful half an hour discussing favorite poets and local bookstores.
it was not until the girl had vanished that he realized she had forgotten her coat.