The plan was laid.

Michael Murdoch opened his eyes at about ten minutes to ten that evening to find the same pretty face looking down at him. He noticed with remarkable vividness the strong white teeth, a gold filling somewhere towards the extremity of her smile, and he heard her speak.

'Feeling better?'

Momentarily he was feeling nothing, not even a sense of puzzlement, and in a dry-throated whisper he managed to answer 'Yes.' But as he lay back and closed his eyes again, his head was drifting off in a giddying whirl and the body it had left behind seemed slowly to be slipping from the sloping bed. He felt a cold, restraining hand on his drenched forehead, and immediately he was back inside his skull once more, with a giant, brown rat that sat at the entrance of his right ear, twitching its nose and ever edging menacingly forward, its long tail insinuating itself centimetre by centimetre into the gaping orifice, and the long white slits of teeth drawing nearer and nearer to a vast and convoluted dome of pale-white matter that even now he recognized: it was his own matter, his own flesh, his own brain.

He heard himself shriek out in terror.

Miss Catharine Edgeley returned to Oxford that night. Her mother had died of a brain tumour; her mother was now buried. And there was little room in Miss Edgeley's mind that night for any thoughts of the last time she had played bridge in North Oxford. Indeed, she had no knowledge at that time that Anne Scott, too, was dead.

Morse's mind was curiously detached as he 'kept walking', eyes frozen forward, along the short length of Canal Reach. With Teutonic recollections the order of the night, he recalled that in Germany the situation might have been regarded as serious but not hopeless, in Austria, hopeless but not serious. Or was it the other way round? To his astonishment, however, he found himself being firmly manipulated towards a police car, parked just round the corner, its gaily-coloured emblem illuminated by the orange glare of a street lamp. And as he reached the car and turned about, he found himself looking slightly upwards into the face of a rather frightened-looking young man.

'You, sir!' It was Detective Constable Walters who was the first to speak, and Morse's shoulders sagged with a combination of relief and exasperation.

'Are you in the habit of arresting your superior officers, Constable?'

A flustered Walters followed the Lancia up to Morse's North Oxford flat, where over a few whiskies the two of them sat and talked until way after midnight. On his own side, Morse came almost completely clean, omitting only any mention of his bribing of the Jericho locksmith. For his part, Walters admitted to his own anxiety about Morse's behaviour, recounted in detail his own investigations, and revealed that after working late in St. Aldates that night he had been on his way to return the few items taken from Canal Reach when he had seen the yellow glow flitting about the dark and silent rooms. Throughout Walters' somewhat discontinuous narrative, Morse remained silent, attentive, and seemingly impassive. When Walters had mentioned the strange discoveries of the chair in the kitchen and the key on the door-mat, Morse had nodded noncommittally, as though the incidents were either of little moment or perfectly explicable. Only during Walters' account of his visit to the Summertown Bridge Club had Morse's eyes appeared to harden to a deeper blue.

'You're in a tricky position, young fellow,' said Morse finally. 'You find a superior officer snooping around in an empty house-a house in which he'd poked his nose the day the dead woman was found-an officer who had no more right to be there than a fourth-grade burglar-so what do you do, Walters?'

'I just don't know, sir.'

'I'll tell you what you ought to have done.' The sudden sharp edge on Morse's voice made Walters look up anxiously. 'If you had any nous at all you would have asked me how I got in. Not really good enough, was it?'

Walters opened his mouth to say something, but Morse continued. 'How long have you been in the Force?'

'Eighteen months altogether, but only three-'

'You've got a lot to learn.'

'I'm learning all the time, sir.'

Morse grinned at the young man. 'Well, you've got something else to learn; and that's exactly what your duty has got to be now. And in case you don't know, I'll tell you. It's your duty to report everything that's happened tonight to Chief Inspector Bell, agreed?'

Walters nodded. The point had been worrying him sorely, and he felt glad that Morse had made things so easy for him. Again he was about to say something, but again he was interrupted.

'But not just yet, understand? I'll see the Assistant Chief Constable first and explain the whole position. You see, Walters, there's something a bit odd about this business; something that needs an older and a wiser head than yours.'

He poured another liberal dose of whisky into Walters' glass, another into his own, and spent the next half-hour asking Walters about his training, his prospects and his ambition; and Walters responded fully and eagerly to such sympathetic interest. At half past midnight he felt the profound wish that he could work with this man; and at a quarter to one, when about to leave, he was only too happy to leave with Morse the items he had originally set out to deposit in the house on Canal Reach.

'How did you get in there, sir?' he asked on the doorstep. 'Did you have a key or-'

'When you've been around as long as I have, Constable, you'll find you don't need a key to get through most doors. You see, the lock on the back door there is a Yale, and with a Yale the bevel's always facing you when you're on the outside. So if you take a credit card and slip it in, you'll find it's just strong enough and just flexible enough to-'

'I know, sir. I've seen it done on the telly.'

'Oh.'

'And er the lock on the back door there isn't a Yale, is it? Goodnight, sir. And thanks for the whisky.'

Morse spent the next hour or so looking through the two Letts' diaries now in his possession, the one (for the current year) just handed to him by Walters, the other (for the previous year) taken a few hours earlier from Canal Reach. If Walters could be trusted, no letters of even minimal significance had been found in the drawers of the desk; and so the diaries were probably as near as anyone could ever come to unlocking the secret life of the late Anne Scott. Not that the entries seemed to Morse particularly promising. Times, mostly: times of trains; times of social events; times of pupils' lessons-yes, that was doubtless the meaning of those scores of initials scattered throughout the pages, several of them recurring at regular (often weekly) intervals over months, and in a few cases over a year or more. The 'E.M.' entry on the Wednesday she'd died held his attention for a while as he knew it must have held the attention of Walters and of Bell. But, like them, he could only think of one person with those same initials: himself. And he had never quite forgiven his parents for christening their only offspring as they had.

Morse slept soundly, and woke late next morning, his brain clear and keen. The images and impressions of all he had learned had flashed across his mind but once, yet already the hooks and eyes of his memories were beginning to combine in strange and varied patterns.