Like millions of other television viewers, I had already seen selected extracts from the film in numerous documentaries about the massacre, and I hardly expected any sudden revelation. But as I relaxed in the viewing theater, I soon realized what a remarkable film this was, and how well it conveyed the curious atmosphere of Pangbourne Village -in its elegant and civilized way a scene-of-the-crime waiting for its murder.

The twenty-eight-minute film was taken by officers of Reading CID soon after eleven o'clock on the morning of June 25, 1988, some three hours after the murders. Thankfully, there is no sound track, and one is glad that none is necessary, unlike the TV programs with their hectoring commentaries full of lurid speculation. This minimalist style of camera work exactly suits the subject matter, the shadowless summer sunlight and the almost blank façades of the expensive houses-everything is strangely blanched, drained of all emotion, and one seems to be visiting a set of laboratories in a hightech science park where no human operatives are employed.

The film opens by the gatehouse that controlled access to the ten mansions, the recreation club and gymnasium which made up the estate. The medallion of the private security firm is visible beside the visitors' microphone, but there is no sign of the uniformed security guard who usually sat at the window.

The camera turns to show the delivery van of the local wine merchants which the police have parked among the ornamental trees on the grass verge. The driver, a pallid young man in his early twenties, is staring in a despondent way at the deep ruts left in the finely trimmed grass, as if the costs of restoring this once-immaculate surface will have to be met from his wages. It was he who gave the alarm, after discovering the first of the bodies as he delivered a case of white burgundy to the Garfield house (No. 3, The Avenue).

The camera fixes on him, and like a badly trained actor he steps forward to the gatehouse, a tic jumping across his sallow cheek. He points to the door, and a uniformed constable opens the armored glass panel to reveal the interior of the office.

A security guard is lying on the floor below the row of television monitors, their screens a blizzard of snow. Someone has cut the cable running from the surveillance cameras mounted all over the estate, but clearly Officer Turner had no time to reach for the telephone whose scissored cord hangs from the desk above his head. Arms pinioned, he lies within a bizarre contraption of rope and bamboo sticks, his neck gripped by a pair of spring-loaded steel calipers, as if in his bored moments he had been constructing a box kite for one of the pampered children of the estate and had been trapped inside it.

In fact, as I can see from the livid contusions on his throat, he has strangled himself after blundering into this lethal cat's cradle which his murderer dropped over his shoulders, its double nooses tightening around his neck as he struggled to free his arms and legs.

The camera leaves the gatehouse and sets off along The Avenue, the tree-lined central drive of the estate. The handsome mansions sit above their ample front lawns, separated from each other by screens of ornamental shrubs and dry-stone walls. The light is flat but remarkably even, a consequence of the generous zoning densities (approx. two acres per house) and the absence of those cheap silver firs which cast their bleak shadows across the mock-Tudor façades of so many executive estates in the Thames Valley.

As well, though, there is an antiseptic quality about Pangbourne Village, as if these company directors, financiers and television tycoons have succeeded in ridding their private Parnassus of every strain of dirt and untidiness. Here, even the drifting leaves look as if they have too much freedom. Thirteen children once lived in these houses, but it is hard to visualize them at play.

For once, unhappily, the pale green slopes of Parnassus are marked with a darker dye. The police camera turns to examine the Garfield family's Mercedes in the driveway of No. 3. Roger Garfield, a merchant banker in his mid-fifties, sits in the rear seat, head leaning against the off-side stereo speaker as if to catch some fleeting grace note. He is a large-chested man with a well-lunched midriff and strong legs that have spent agonizing hours on an exercise cycle. He has been shot twice through the chest with a small-caliber handgun. Almost as surprising, he is wearing no trousers, and bloodstained footprints emerging from the house indicate that he was shot while dressing after his morning shower. He somehow managed to walk downstairs and take refuge in his car. Perhaps his clouding mind still assumed that he would be driven to his office in the City of London.

But the Mercedes was going nowhere. Garfield 's chauffeur had been shot dead a few moments after his employer. A white-haired man in a black uniform, Mr. Poole lies face down in the bed of orange-tipped cannas beside the front door, cap still held in his right hand.

The camera pauses over him and then enters the house, following the bloody footprints through the open door. Garfield and his wife had made numerous trips to Hong Kong, and the rooms are filled with pieces of chinoiserie-large porcelain vases stand on the blackwood furniture, and there are pairs of Ming horses and jade figurines. Surprisingly, none have been disturbed, suggesting that the murderers had approached their victims without surprise. The housekeeper, Mrs. West, lies shot below the marble mantelpiece in the drawing room, interrupted while doing her dusting. In an upstairs bathroom the camera finds Mrs. Garfield, a handsome woman in her late forties, slumped against the glass door of the shower stall, her yellow toothbrush still in her hand.

All trace of the Garfields ' sixteen-year-old son, Alexander, had vanished. His bedroom, study and bathroom were undisturbed. Only in his mother's blood flowing across the bathroom tiles could be seen the smeared prints of Alexander's rubber-cleated shoes, left behind as he was seized and swept away by his abductors.

The police video continues on its grim and matter-of-fact way. The camera leaves Garfield seated in his Mercedes and gazes across the tranquil lawns at the next macabre tableau. As the two constables outside the Reade house (No. 1, The Avenue) step back from the colonnaded porch, the camera reveals the lavish interior of the property tycoon's home, so filled with French furniture and objets d'art that it resembles one of the larger rooms at the Wallace Collection. Yet not a glass cabinet has been rifled, not a Sevres plate shattered, not an ormolu clock toppled from its pedestal.

Indeed, Mr. and Mrs. Reade sit at their breakfast table in the dining room, lying back in their chairs at opposite ends of the lacquered oblong as if momentarily overwhelmed by the calm and richness of the life they have arranged for themselves. Both have been efficiently shot by assailants who have crept so close to them that the cutlery beside their napkins is undisturbed. Only the place settings of the Reades' daughters, Annabel and Gail, have been scattered to the floor as these orphaned children made a desperate attempt to resist their kidnappers.

The camera resumes its melancholy tour. By the time it reaches the third house, the Gropius-inspired home of a distinguished concert pianist, the sequence of entrances, deaths and exits begins to resemble a nightmare exhibition that will never end. House by house, the assassins had moved swiftly through the estate on that quiet June morning, killing the owners, their chauffeurs and servants, before abducting the thirteen children. Husbands and wives were shot down across their still-warm beds, stabbed in their shower stalls, electrocuted in their baths or crushed against their garage doors by their own cars. In a period generally agreed to be no more than twenty minutes, some thirty-two people were savagely but efficiently done to death.

However, as the film ended, with a visit to the perimeter guard post where the second security officer had been killed by a single bolt from a crossbow, I was struck by the way in which Pangbourne Village remained aloof from this day of death. The owners of these elegant houses had been dispatched with the least damage to the fabric of their homes, as if the façades of professional and upper-middle-class life were their most solid and lasting substance.

Indifferent to the lives, and deaths, negotiated within its walls, Pangbourne Village would endure. Once the mystery of this mass murder and kidnapping had been solved, a seemingly impossible task with which I had now been charged, a new cast of tenants would soon be recruited to fill these calm drawing rooms. For some reason, as I left the viewing theater and stepped into the traffic-filled clamor of a Whitehall evening, I gave a small shudder for those new arrivals.