Cribb, in sole occupation of the room, and with the key to the dynamite-store in his pocket, allowed himself a moment’s reflection. He had secured a position of trust in the dynamite party. With the help of a gun from the drawer, he was perfectly capable of surprising Devlin and taking him in charge. Rossanna and McGee would be even less trouble. They could all take the place of Thackeray in the wood-store until police reinforcements arrived.
What held him back was the promise of something better: the exposure and defeat of McGee’s plan. Premature arrests would allow the Clan to assign the mission-whatever it was-to another group. No, there was always an optimum moment to swoop, and it was not yet.
The one thing gnawing at his conscience was the helplessness of Thackeray. If the torturing continued, he would certainly intervene. There was more than a possibility, though, that Devlin and Rossanna were now too occupied preparing for the visitors to expend more time trying to extract information from their stubborn prisoner.
Sensible as all this seemed, it left him with the task of building two infernal machines in little more than twenty-four hours. Why had Rossanna insisted upon two? Was one to be kept in reserve in case the first failed? He doubted it. The object of the demonstration was to make a strong and instantaneous impression on the emissaries from America. To admit that the first bomb had not exploded-and there would be a short delay while the second was rowed out and lowered into position in hope of more success-was unlikely to win anyone’s confidence.
Surely it was likelier that the second bomb was wanted for some other target, perhaps in fulfilment of what Rossanna had termed ‘the ultimate object of all our work’. If so, he had the opportunity of foiling the scheme by building one incapable of detonation. Marvellously straightforward-if only Rossanna had not insisted that her father would inspect both boxes when their contents were ready, and select the one to be used for the demonstration. Cribb’s credibility depended on the success of the explosion by the lake.
The rest of that day and well into the afternoon of the next was one of the most exacting and intensive periods of work he had ever set himself. As well as the dangerous task of assembling the bombs and making the infinitesimal adjustments that would decree success or failure, he had much to do at the lakeside, surveying the gazebo, rowing around its three sides and under the arched supports, calculating and preparing. Failure to destroy the building would be catastrophic, an admission of incompetence. In the merciless canon of the dynamite conspiracy, it warranted death.
At four o’clock he asked Devlin to inform Rossanna that the machines were ready. She came out to the lawn where, in the interests of safety, he had arranged the squat, black boxes.
‘So here they are like two picnic-boxes!’ she said. ‘How much cold turkey did you put inside, Mr Sargent?’
‘About twenty-five pounds in each, if I understand your meaning correct, Rossanna. I’m allowing for some resistance, you see.’
‘It sounds a lot to me, but I’m sure you’re the expert. Lift the lids, please, and show me the insides. Ah, how very neat! And both clocks ticking merrily away and keeping excellent time.’
‘Nothing will be activated until the alarms are set,’ said Cribb. ‘But I don’t advise anyone to touch the parts. It only wants the slightest pressure on a trigger. .’
‘I’m sure,’ said Rossanna. ‘Well, I shall save my congratulations for later. The visitors will be here at six o’clock. Father has decided that the destruction of the folly will take place exactly two hours after that. He wants you to remain out of sight until the smoke has cleared. Then you will appear, like Mephistopheles.’
‘I hope it impresses ’em,’ said Cribb with total sincerity. ‘What are their names?’
‘Mr Carse and Mr Millar. I have not met them myself. Father knows them, though. They are patriots like the rest of us, but they have the reputation of being hard-headed men. Now, gentlemen, if you would be good enough to go to the kitchen I think there is some ale there for you. While you are gone, I shall bring Father out to inspect the machines. He will wish to see them alone. Do not be concerned, Mr Sargent. I shall insist that he touches nothing. If you return in half an hour, I shall tell you which box is to be used tonight and you can activate the mechanism. Then we shall seal it, and you, Patrick, can help Mr Sargent convey it to the lake and deposit it as he directs.’
The first sign of the approach of spectators at the lakeside that evening was a flash of pale yellow through the trees, the shawl Rossanna was wearing, caught by the low-angled rays of the sun. They were using a more even path than the one she had led Cribb along on his first visit to the gazebo, probably because McGee was of the party. There were three bowler-hatted figures walking behind the chair.
Cribb picked up the field-glasses he had borrowed from the house, and looked for Carse and Millar. One of the bowlers was Devlin’s, so he moved quickly on to the next. It was worn by a thick-set, grey-bearded man with florid skin and bulbous features. He was talking as he walked, using his clenched right fist to emphasise points.
Cribb shifted the focus to the second newcomer, who was speaking to no one, seeming content to stay remote from the rest of the party. He stared fixedly ahead through thick, pebble-glass spectacles with wire frames. His height was not much over five feet and he had compensated for this by cultivating a large black moustache, bow-shaped so that the ends reached almost to the line of his jaw. For all the forceful gestures of the big man, this one conveyed more menace.
They stopped at the waterside, some eighty yards from the gazebo on the other side of the lake. It was fully two hours since Cribb and Devlin had lowered the box by ropes from the rowing-boat into the water. They had lodged it as closely as possible to the base of one of the arched supports. It had seemed to come to rest gently. Nothing inside the box should have been disturbed. They had not remained long in the vicinity after lowering the bomb, even so.
Cribb took out a silver watch Devlin had loaned him. Possibly it had belonged to Malone. It registered two minutes to eight. He flicked his tongue tensely across his upper lip and stared across the water at the gazebo. It looked depressingly solid in construction, its reflection giving the illusion that there was as much brickwork below the surface as above. Two crows were perched on the battlements. How humiliating if the explosion just dislodged a few bricks and failed to disturb the birds. .
Feeling not at all like Mephistopheles, he started walking under cover of the trees towards the waiting group, ready to appear on cue. Those two minutes must have ticked away by now. At least, he wryly observed, the thing had not gone off before time.
He was near enough now to hear the murmur of conversation, and most of it seemed to be coming from the larger of the two emissaries, punctuated with the kind of laughter one hears filling the intervals at firework displays, when the set pieces are slow in igniting. The other, standing apart, had his watch in his hand and was concentrating all his attention on the gazebo.
Cribb had gone as close to the others as he could without revealing his presence. He stood behind a tree, took out the watch and lifted the cover. Three minutes past the hour. They were not going to wait much longer and nor was he. If he made a dash to the house now, he should be able to get to the kitchen and release Thackeray, and the two of them might get clear before the alarm was raised.
Even as he was reaching a decision, the leaves above him rustled and a boom of reassuring volume shattered the calm of the evening. Before doing anything else, he put back the hands of the watch to precisely eight o’clock.