He watched his exhaled smoke as the wind carried it upward, listening to the rustling sound that same wind initiated in the leaves of the big maple tree in front of the three-flat redbrick building he called home. This part of the Far North Side neighborhood, Rogers Park, was pretty quiet. Wren’s building was about eight blocks west of the lake, where traffic, both automobile and pedestrian, was much heavier. But out here on West Lunt, the apartment buildings and homes were modest and the neighborhood less transient than those closer in to the water.