She looked at me with an insufferably smug grin and said, 'Cartographer's folly.'
'Cartographer's what?'
'Folly.'
I licked the vanilla slowly.
'You see,' continued Calamity, 'everyone knew there had to be a link to all these murders, but no one could see what it was. The kids were chalk and cheese: Evans and Bronzini and Llewellyn on one hand, Brainbocs on the other.'
'Right. So what was the link?'
She paused for effect and took a long slow deliberate slurp. 'The police couldn't see it at all.'
'I know; and you could. Now what is it?'
'Boy, they were all over the place. Not a clue.'
'Are you going to tell me or not?'
She stopped slurping and turned to look at me. 'The school bus.'
'The school bus?'
'It really fooled me for a while. You see, the police were talking a load of nonsense about them all living in the same area. But you only had to look at a map to see that wasn't true. I know, because I did look at a map. In fact, I spent hours looking at one. And the funny thing was, although it was plain the police were barking up the wrong tree, I kept getting this feeling that there was something there. And then I saw it, they were all on the same bus route. Maybe, I thought, the school bus was the link. But then, if it was as simple as that, why not arrange for the bus to crash? That way you get everybody in one hit. Then it struck me.'
I finished my ice and threw the empty cone into the bin. 'Are you going to get to the point before sunset?'
'You have to follow the reasoning behind what I'm telling you. Do you think I'm going through all this for fun?'
'Yes, I do. But go on in your own time.'
'I have to tell you, I was foxed.'
I threw my head back and groaned.
'So I went back to the map a second time, and stared, and stared and stared. And then I had it. 'Eureka!' I shouted.'
She looked at me with a mixture of triumph -and the impudent knowledge that I still had no idea what she was talking about.
'You're fired.'
'Aw! Don't be a misery!'
'You've got one minute.'
She tutted and rolled her eyes. 'Do you know how map makers protect their work against illegal copying?'
'No.'
'You've got to understand with a map it's very difficult to prove copyright infringement. If someone wants to publish a map but is too lazy to put on their wellies and go out with a measuring stick, they can just buy someone else's map and copy it. Save themselves a lot of walking around in the mud. After all, the landscape is already there and you're just recording it. So everyone's map should be the same anyway, shouldn't it?'
I nodded, with a puzzled look slowly creeping across my brow.
'So if you are an honest map maker, how do you protect yourself?'
'I give in.'
'I'll tell you. You put things in which don't exist. For example, you make up a hill and call it Louie's Knoll. There's no such thing in real life, so if it appears on someone else's map, the implication is, they copied yours.' She looked at me with the fire of discovery in her eyes. 'It's called a cartographer's folly.'
'I'm still lost. Was Brainbocs a map maker?'
Calamity put a conspiratorial hand on my arm, looked round and then continued in a lowered voice, 'Brainbocs was smarter than Einstein. Normally, he would get 100 per cent for every piece of homework he did. Trouble was, although he had the brains of Einstein, he had the fighting ability of a squirrel. Just about anyone could copy his homework and there was nothing he could do about it. So he would deliberately put in weird errors. The sort which no one who had actually done the homework could possibly make. Then when the same mistakes cropped up in other people's work, the teacher would guess what was going on. It was like his personal watermark.'
'And Evans, Llewellyn and Bronzini copied his homework on the bus to school each morning?'
'That's right. Everyone knows Lovespoon warned Brainbocs to steer clear of whatever it was he was writing about. But Brainbocs wouldn't listen. He must have stumbled on something; something so awful that the Welsh teacher had to kill him. But when he gets three more pieces of homework with Brainbocs's watermark he has to kill the other three as well.'
'And what was it Brainbocs writing about?'
Calamity leaned closer and said in her best cloak-and-daggery voice: 'No idea.'
Chapter 7
NO ONE KNEW what Dai Brainbocs wrote in that essay. Or, at least, if they did they weren't telling. Could a fifth-form kid write something so bad his teacher was obliged to kill him? I didn't know but I didn't have any other angle to work on and I spent the following week asking around. So did Calamity. Meirion sent me some cuttings from the
* * *
The week after Brainbocs's corpse was found in the cheese, Evans the Boot disappeared from the scene. The date was hard to pinpoint because he was such an elusive character, it took a while before anyone realised he had gone. And even then it was some time before people dared believe it. Not long after that a member of his gang, Llewellyn Morgan, received the 'squirt water in your eye' flower anonymously through the post. He tested it out on the balcony of his council estate flat and was so maddened by the cobra venom that he fell over the edge, digging at his eyes with his fingers in such a frenzy that they later found eyeball jelly under the nails. He fell nineteen floors but according to the pathologist would have been dead by the time he passed the eighth or ninth. Bronzini and the fireman's son — both members of the same gang — were the most recent victims. Whoever killed Bronzini must presumably also have been the one who stuck my business card up his backside, which suggested they already knew I was investigating the case, even before I did. None of the articles mentioned the stolen tea cosy.
I put the newspaper articles down flat on the window ledge of the Tropicana Milk Bar and took a drink from my strawberry milk shake. It was nearing the end and the straw made that loud plug-hole sound, which filled the whole restaurant with a grotesque burbling. Perhaps if Brainbocs had still been alive he could have turned the attention of his genius to solving that one.
The Tropicana was a great place to sit and watch the world go by. Like a lot of cafes round town it hadn't succeeded in making the leap into the last quarter of the twentieth century by acknowledging the existence of cappuccinos and espressos, but the shakes in lurid, primary colours were good and you could also get burgers and hot dogs and the juke box wasn't too loud. There was a set of Formica tables in the centre, with seats screwed to the floor, and along the window where I was sitting there was a shelf at chest height with stools covered in red vinyl. Pandora and Bianca walked past the window and waved when they saw me but they didn't stop. I watched