‘I don’t know what more I can tell you, Mr Bryant,’ said Dan Banbury. The detectives had returned to the Unit after visiting Kershaw, because they knew Banbury would be back from the crime scene. ‘It appears that Noah Samuel Kramer was removed from his cot at around nine o’clock P.M. tonight. Giles has told you he was shaken and strangled to death, and his body sustained further injuries from a fall, and I’m telling you he was thrown from the end of the cot through an open window into the basement area of the building. There are no footprints on the wet rug beneath the sill. There are faint depressions on the other rug that the cot stands on, because that’s where everyone has to stand in order to reach in and pick the baby up.’
‘But no definable prints.’
‘No. It’s a hard-wearing cord that doesn’t hold heel marks. The door of the nursery was securely locked on the inside, with the key still firmly in place. The key turns easily enough but it’s tricky to actually get out, so I guess they just left it in the door. There were no signs of tampering with the lock, and Mr Kramer had been forced to kick the door in. A couple of minutes after he did this, the noise, and Mrs Kramer’s scream, attracted the attention of the party guests, eleven of whom came to see what the problem was. They saw the damage and naturally entered the room, but Mr Kramer sensibly realised that a crime had been committed and stopped them from coming all the way in. He could see that the rug beneath the window was wet and that the rails of the cot might hold prints. As it was, there weren’t any.’
‘What, none at all?’ asked May.
‘Well, I got prints from the nanny and Mrs Kramer, but that’s all. As for the floor, it’s hardwood and hadn’t been cleaned in several days, so there are a few scuff marks which we’ll try to identify by matching against the shoes of the guests and those in the Kramers’ closets, but there are no water marks. I’m bothered by the fact that there’s nothing on the rug, because the killer had to have left the room by the window and it would be physically impossible to do so without putting a foot down. There’s simply no other method of exit unless we find some kind of secret panel in the room—’
‘There are quite a few houses in London with secret panels,’ Bryant pointed out.
‘I was joking, Mr Bryant. The house was converted into flats from offices three years ago, it’s not Gormenghast. All the walls are new and solid. So the killer had to climb out of the window, and unless he could fly he would have had to place a foot on the rug. Likewise if he came in that way.’
‘Is there any way he could have scaled the building and entered from the outside?’ asked Meera Mangeshkar.
‘The toilet window is about fifteen feet away and the nearest drainpipe is at least seven feet away,’ said Banbury. ‘I don’t see how that would be possible.’
‘Parkour,’ suggested Longbright. ‘That jumping thing kids do.’
‘I think you’ll find that’s defined as the art of overcoming obstacles in your path by adapting your movements to the environment,’ Bryant recited. ‘I’ve watched lads doing it down the South Bank on a Sunday morning.’
‘They can climb a wall just using their fingertips, can’t they?’
‘That still leaves the closed and locked window, the print-free rug, the lack of raindrops shaken onto or around the cot—it was howling down outside, remember—and so far no witnesses from the buildings opposite or the street below. Have we got any CCTV cameras outside?’
‘A couple mounted at either end of the avenue but not in the middle,’ said Longbright. ‘We’re checking them for coverage at the moment. Westminster has an e-map of every CCTV in central London.’
‘And no unexpected fingerprints anywhere? You checked the whereabouts of the nanny?’
‘At her mother’s bedside in Kent. And Mrs Kramer was downstairs in the lounge at the estimated time of Noah’s death,’ said Banbury. ‘I want to run checks on fibres from the floor and rugs if we can scrape together the lab costs, but I’ve got nothing out of the ordinary.’ He sat back with his thick arms folded, defying anyone to come up with a theory.
‘Mr Punch,’ muttered Bryant, fishing about for his pipe.
‘I’m sorry, Mr Bryant?’
‘Well, he seems to be the obvious culprit. If Mr Punch had killed the baby, there’d be no conflicting evidence, would there?’
‘That’s right, Mr Bryant. The only thing Mr Punch lacks is the motor movement that usually comes from muscles controlled by the human brain.’