Streets present their profiles during the day and their secrets at nights. Mysteries sketched in daylight are sometimes resolved after dark and, at times, in the wee small hours of the morning. Some events or encounters can be as dramatic and spellbinding as scenes from action movies. At a certain point, one might actually walk directly into a scene being produced for a TV series-for real. The muffled bang that vibrates a mild fall morning turns out to be an exploding grenade aimed at the United Nations Assembly Building hours before Che Guevara is to address the general assembly. Welcome to the streets of New York. Quiet scenes might include a man dying next to you at Christmas time on a subway train. Or you might come face-to-face with Frank Sinatra very, very late on a winter's night-"Out for a stroll," as he puts it.