THE SUN WENT DOWN and someone in the night crew snapped on the bright overhead lights. Rich and I were still wandering around in the dark. Somewhere, a very smug killer was having his dinner, toasting himself on his success, maybe planning another fire - and we didn’t know who he was or when he would strike again.

  While Chi and McNeil reinterviewed the Malones’ and the Meachams’ friends and neighbors, Conklin and I sat at our desks, going over the murder book together. We reviewed Claire’s findings, the photos of rubberneckers at the fire scenes, the handwriting expert’s comparison of the inscriptions in each of the books left at the fire scenes, and the expert’s opinion: “I can’t say one hundred percent because it’s block lettering, but looks like all the samples were written by the same hand.”

  We reviewed our own eyeball tours of the crime scenes, trying to reduce all of it to a few illuminating truths, speaking in the kind of shorthand that you use with a partner. And I felt that other connection, too, the one I wouldn’t let Rich mention but sometimes just arced across our desks. Like it was doing now.

  I got up, went to the bathroom, washed my face, got a cup of coffee for me and one for Conklin, black, no sugar. Sat back down, said, “Now, where were we?”

  As the night tour walked and talked around us, Rich ticked off on his fingers what we had: “The couples were all in their forties and well-to-do. The doors to all the houses were unlocked, and the alarms weren’t set. No sign of gunfire. The couples all had a child of college age. They were all robbed, but the killer took only jewelry and cash.”

  “Okay, and here are a few suppositions,” I said. “The killer is smart enough and unthreatening enough to talk his way into the houses. And I’m going to also say that it seems probable that there were two assailants; one to tie up the victims, one to hold a gun.”

  Rich nodded, said, “He or they used fishing line as ligatures because they’d burn off quickly in the fire. And they used an untraceable accelerant. That’s careful. They don’t leave evidence, and that’s smart.

  “But I don’t think Molly Chu was in the plan,” Rich added. “This is the first time another person was in the house with the victims. I’m thinking Molly had already passed out from smoke inhalation when her ‘angel’ found her and subsequently carried her out. Kind of heroic, wouldn’t you say?&rd............