Everyone is watching someone this time around. Kreizler meets an old patient and discovers some simplistic psychology. Sara observes a young mother with an empty perambulator. Moore asks Mary out to a moving picture show. The Issacson brothers are looking to the sky and discover how the killer climbs up and down. And by the end, the killer is perhaps watching the entire group as they wonder why Kreizler has called them all together—as does Kreizler, who did not. Surveillance takes its toll…