"It's my guess that the kids knew who I was. If they cased Harry's as thoroughly as it seems they did, they must have seen me go in and out several times. They knew that it was my fault that two of their members got picked up, so they decided to teach me a lesson. One of them must have come up here, even before I left Harry's. The other followed me, just to make sure I was really coming home. Since he knew where I was going, he didn't have to stick too close, so I didn't spot him in the crowd. He might even have gone on up to 116th Street so that I wouldn't see him get off at 110th." "Sounds reasonable," Cowder agreed. "We know who the kids are. The uniformed squads are rounding up the whole bunch for questioning. They call themselves--you'll get a laugh out of this!--they call themselves the Rocketeers." "I'm fracturing my funny bone," said Mike the Angel. "The thing that gets me is this revenge business, though. Kids don't usually go that far out for fellow gang members." "Not usually," the sergeant said, "but this is a little different. The girl you caught and the boy who got killed over at the cathedral are brother and sister." "That explains it," Mike said. "Rough family, eh?" Sergeant Cowder shook his head. "Not really. The parents are respectable and fairly well off. Larchmont's the name. The kids are Susan and Herbert--Sue and Bert to you. Bert's sixteen, Sue's seventeen. They were pretty thick, I gather: real brother and sister team." "Good family, bad kids," Mike muttered. He had wandered over to the wall to look at his Dali. It had fallen to the floor, but it wasn't hurt. The Valois was bent, but it could be fixed up easily enough. "I wonder," Mike said, picking up the head of a smashed figurine and looking at it. "I wonder if the so-called sociologists have any explanation for it?" "Sure," Cowder said. "Same one they've been giving for more decades than I'd care to think of. The mother was married before. Divorced her husband, married Larchmont. But she had a boy by her first husband." "Broken home and sibling rivalry? _Pfui!_ And if it wasn't that, the sociologists would find another excuse," Mike said angrily. "Funny thing is that the older half brother was a perfectly respectable kid. Made good grades in school, joined the Space Service, has a perfectly clean record. And yet _he_ was the product of the broken home, not the two younger kids." Mike laughed dryly. "_That_ ought to be food for high sociological thought." The door announcer chimed again, and Cowder said: "That's probably the lab boys. I told them to come over here as soon as they could finish up at the cathedral." Mike checked his screen and when Cowder identified the men at the door, Mike let them in.