"Actually," Frank said, feeling on the floor for his smokes, "we do. There's an English postgrad called Brenda Grealey, had the same supervisor as Lexie." Brenda Grealey was on the KA list: large, with sticking-out gooseberry eyes, plump cheeks already beginning to droop and a lot of ginger curls. "She's the nosy type. After the five of them moved in together, she asked Lexie if she ever got any privacy, living with all those guys. I get the feeling Brenda meant it as a double entendre, she was hoping for some kind of wild sex gossip, but apparently Lexie just gave her a blank look and said she went for solo walks every evening and that was all the privacy she needed, thanks, she didn't hang out with people unless she liked their company. Then she walked off. I'm not sure our Brenda realized she'd been bitchslapped."

"OK," I said. "In that case, I really can't see a way to make any of the housemates work. Look at how it would've had to play out. One of them needs to talk to Lexie in private, about something big. So, instead of going about it the inconspicuous way, bringing her for coffee in college or whatever, he goes on her walk with her, or follows her out. Either way, he's breaking the routine--and those five are all about the routine--and telling everyone including Lexie, loud and clear, that something's up. And then he brings along a knife. These are nice middle-class intellectuals we've got here--"

"She means they're a bunch of nancy boys," Frank informed Sam, over the click of his lighter.

"Ah, here," Sam said, putting his pen down. "Hang on. You can't rule them out just because they're middle-class. How many cases have we worked where some lovely, respectable--"

"I'm not, Sam," I said. "The killing's not the problem. If she'd been choked to death, or had her head smashed off a wall, I'd be fine with one of them as the doer. I don't even have a problem with the idea of one of them stabbing her, if he happened to be there with the knife in his hand. What I'm saying is that he wouldn't have the knife on him to begin with--not unless he was actually planning to kill her, and like I said before, that doesn't fit. I'm willing to bet serious money that those four don't make a habit of carrying knives around; and if they just wanted to threaten someone, or convince someone, it wouldn't even occur to them to use a knife to do it. That's not the world they live in. When they gear up for a big fight, they prepare by thinking out debate points, not picking out knives."

"Yeah," Sam said, after a moment. He took a deep breath and picked up his pen again, left it hanging above the page as if he'd forgotten what he meant to write. "I suppose they do, sure."