There were quiet footsteps again, and then George stood beside her. He said, "You shouldn't be out here in the alley, alone."
"It's safe, George. It's right under a light and right outside the door. I'd have plenty of time to get back inside if I saw or heard anyone coming from either direction."
"I suppose so," he said. "I guess I worry too much. But did you read the editorials in both of yesterday's papers?"
"No, I didn't. Something about the—the psycho?"
"Yes, and it was something that needed to be written. In fact, the police suggested to the editors of both papers that it be written, and my friend, the captain in charge of homicide, talked it over with me before he made the suggestion to them. I've got a copy of one of the editorials—and the other says approximately the same thing—in my office if you'd care to read it. Or I can tell you what it says, if you'd prefer."
Ruth said, "I think I'd as soon you tell me, if you don't mind. I suppose it warns women to stay out of dark alleys."
"Among other things, yes. You see, Ruth, a criminal—whether sane or psychotic—does tend to repeat the pattern of a crime. The modus operandi. But unless he's a moron he'll vary the pattern if and when his modus operandi becomes impossible, for any reason, for him to repeat.
"And that's exactly what our psychotic killer is going to find himself up against if and when he decides to commit another crime. We don't know what kind of a gimmick he used to get his first two victims to open their doors for him, but whatever it was it's not likely to work for him again. Every woman in the city is scared and has been since the second crime, since it's looked as though he may be starting a series of such crimes."
"I see," Ruth said. "And the police think he'll try a different—uh—modus operandi the next time?"
"They do. He'll almost have to, to succeed. Just what he'll try, they don't know, of course. He might slug a woman on the street and drag or carry her into an alley or an areaway. He might break into her place while she's away and be there waiting for her when she comes home and lets herself in. Those are the two main possibilities, but there are others. The point is, a woman can't consider herself safe just because she keeps the door bolted whenever her husband is out. Not that she should neglect that precaution, either. He may try his former method several times, and vary it only if he finds out that it doesn't work. You do have a chain bolt, don't you?"