'Chris Lunn and his son are very similar sounds.'

'But Lunn doesn't announce himself that way. All the time I was with Sir Ronald and Miss Learning they just called him Lunn.'

'Look, Cordelia, you can't possibly suspect Ronald Callender of having a hand in his son's death! Be logical. You accept, I suppose, that a rational murderer hopes not to be found out. You admit, no doubt, that Ronald Callender, although a disagreeable bastard, is a rational being. Mark is dead and his body cremated. No one except you has mentioned murder. Then Sir Ronald employs you to stir things up. Why should he if he's got something to hide? He doesn't even need to divert suspicion, there is no suspicion.'

'Of course I don't suspect him of killing his son. He doesn't know how Mark died and he desperately needs to know. That's why he's taken' me on. I could tell that at our interview; I couldn't be wrong about that. But I don*t understand why he should have lied about the telephone call.'

'If he is lying there could be half a dozen innocent explanations. If Mark did ring the college it must have been something pretty urgent, perhaps something which his father didn't want to make public, something which gives a clue to his son's suicide.'

'Then why employ me to find out why he killed himself?'

'True, wise Cordelia; I'll try again. Mark asked for help, perhaps an urgent visit which Dad refused. You can imagine his reaction. "Don't be ridiculous, Mark, I'm dining at High Table with the Master. Obviously I can't leave the cutlets and claret just because you telephone me in this hysterical way and demand to see me. Pull yourself together." That sort of thing wouldn't sound so good in open court; coroners are notoriously censorious.' Hugo's voice took on a deep magisterial tone.' "It is not for me to add to Sir Ronald's distress, but it is, perhaps, unfortunate that he chose to ignore what was obviously a cry-for help. Had he left his meal immediately and gone to his son's side this brilliant young student might have been saved." Cambridge suicides, so I've noticed, are always brilliant; I'm still waiting to read the report of an inquest where the college authorities testify that the student only just killed himself in time before they kicked him out.'

'But Mark died between seven and nine p.m. That telephone call is Sir Ronald's alibi!'

'He wouldn't see it like that. He doesn't need an alibi. If you know you're not involved and the question of foul play never arises, you don't think in terms of alibis. It's only the guilty who do that.'

'But how did Mark know where to find his father? In his evidence Sir Ronald said that he hadn't spoken to his son for over two weeks.'

'I can see you have a point there. Ask Miss Learning. Better still, ask Lunn if it was, in fact, he who rang the college. If you're looking for a villain Lunn should suit admirably. I find him absolutely sinister.'

'I didn't know that you knew him.'

'Oh, he's pretty well known in Cambridge. He drives that horrid little closed van around with ferocious dedication as if he were transporting recalcitrant students to the gas chambers. Everyone knows Lunn. Seldom he smiles and smiles in such a way as if he mocked himself and scorned his spirit that could be moved to smile at anything. I should concentrate on Lunn.'

They walked on in silence through the warm scented night while the waters sang in the runnels of Trumpington Street. Lights were shining now in college doorways and in porters' lodges and the far gardens and inter-connecting courts, glimpsed as they passed, looked remote and ethereal as in a dream. Cordelia was suddenly oppressed with loneliness and melancholy. If Bernie were alive they would be discussing the case, cosily ensconced in the furthest corner of some Cambridge pub, insulated by noise and smoke and anonymity from the curiosity of their neighbours; talking low-voiced in their own particular jargon. They would be speculating on the personality of a young man who slept under that gentle and intellectual painting, yet who had bought a vulgar magazine of salacious nudes. Or had he? And if not, how had it come to be in the cottage garden? They would be discussing a father who lied about his son's last telephone call; speculating in happy complicity about an uncleaned spade, a row of earth half dug, an unwashed coffee mug, a quotation from Blake meticulously typed. They would be talking about Isabelle who was terrified and Sophie who was surely honest and Hugo who certainly knew something about Mark's death and who was clever but not as clever as he needed to be. For the first time since the case began Cordelia doubted her ability to solve it alone. If only there were someone reliable in whom she could confide, someone who would reinforce her confidence. She thought again of Sophie, but Sophie had been Mark's mistress and was Hugo's sister. They were both involved. She was on her own and that, when she came to think about it, was no different from how essentially it had always been. Ironically, the realization brought her comfort and a return of hope.

At the corner of Panton Street they paused and he said:

'You're coming back to the party?'

'No, thank you, Hugo; I've got work to do.'

'Are you staying in Cambridge?'

Cordelia wondered whether the question was prompted by more than polite interest. Suddenly cautious, she said:

'Only for the next day or two. I've found a very dull but cheap bed and breakfast place near the station.'

He accepted the lie without comment and they said goodnight. She made her way back to Norwich Street. The little car was still outside number fifty-seven, but the house was dark and quiet as if to emphasize her exclusion and the three windows were as blank as dead rejecting eyes.

She was tired by the time she got back to the cottage and had parked the Mini on the edge of the copse. The garden gate creaked at her hand. The night was dark and she felt in her bag for her torch and followed its bright pool round the side of the cottage and to the back door. By its light she fitted the key into the lock. She turned it and, dazed with tiredness, stepped into the sitting-room. The torch, still switched on, hung loosely from her hand, making erratic patterns of light on the tiled floor. Then in one involuntary movement it jerked upwards and shone full on the thing that hung from the centre hook of the ceiling. Cordelia gave a cry and clutched at the table. It was the bolster from her bed, the bolster with a cord drawn tight about one end making a grotesque and bulbous head, and the other end stuffed into a pair of Mark's trousers. The legs hung pathetically flat and empty, one lower than the other'. As she stared at it in fascinated horror, her heart hammering, a slight breeze wafted in from the open door and it swung slowly round as if twisted by a living hand.

She must have stood there rooted with fear and staring wild-eyed at the bolster for seconds only, yet it seemed minutes before she found the strength to pull out a chair from the table and take the thing down. Even in the moment of repulsion and terror she remembered to look closely at the knot. The cord was attached to the hook by a simple loop and two half hitches. So, either her secret visitor had chosen not to repeat his former tactics, or he hadn't known how the first knot had been tied. She laid the bolster on the chair and went outside for the gun. In her tiredness she had forgotten it, but now she longed for the reassurance of the hard cold metal in her hand. She stood at the back door and listened. The garden seemed suddenly full of noises, mysterious rustlings, leaves moving in the slight breeze like human sighs, furtive scurryings in the undergrowth, the bat-like squeak of an animal disconcertingly close at hand. The night seemed to be holding its breath as she crept out towards the elder bush. She waited, listening to her own heart, before she found courage to turn her back and stretch up her hand to feel for the gun. It was still there. She sighed audibly with relief and immediately felt better. The gun wasn't loaded but that hardly seemed to matter. She hurried back to the cottage, her terror assuaged.