'For God's sake,' cried Zero, clutching hold of the young man, 'for God's sake command yourself! We stand upon the brink; death yawns around us; a man - a stranger in this foreign land - one whom you have called your friend - '

'Silence!' cried Somerset, 'you are no friend, no friend of mine. I look on you with loathing, like a toad: my flesh creeps with physical repulsion; my soul revolts against the sight of you.'

Zero burst into tears. 'Alas!' he sobbed, 'this snaps the last link that bound me to humanity. My friend disowns - he insults me. I am indeed accurst.'

Somerset stood for an instant staggered by this sudden change of front. The next moment, with a despairing gesture, he fled from the room and from the house. The first dash of his escape carried him hard upon half-way to the next police-office: but presently began to droop; and before he reached the house of lawful intervention, he fell once more among doubtful counsels. Was he an agnostic? had he a right to act? Away with such nonsense, and let Zero perish! ran his thoughts. And then again: had he not promised, had he not shaken hands and broken bread? and that with open eyes? and if so how could he take action, and not forfeit honour? But honour? what was honour? A figment, which, in the hot pursuit of crime, he ought to dash aside. Ay, but crime? A figment, too, which his enfranchised intellect discarded.

All day, he wandered in the parks, a prey to whirling thoughts; all night, patrolled the city; and at the peep of day he sat down by the wayside in the neighbourhood of Peckham and bitterly wept. His gods had fallen. He who had chosen the broad, daylit, unencumbered paths of universal scepticism, found himself still the bondslave of honour. He who had accepted life from a point of view as lofty as the predatory eagle's, though with no design to prey; he who had clearly recognised the common moral basis of war, of commercial competition, and of crime; he who was prepared to help the escaping murderer or to embrace the impenitent thief, found, to the overthrow of all his logic, that he objected to the use of dynamite. The dawn crept among the sleeping villas and over the smokeless fields of city; and still the unfortunate sceptic sobbed over his fall from consistency.

At length, he rose and took the rising sun to witness.

'There is no question as to fact,' he cried; 'right and wrong are but figments and the shadow of a word; but for all that, there are certain things that I cannot do, and there are certain others that I will not stand.' Thereupon he decided to return to make one last effort of persuasion, and, if he could not prevail on Zero to desist from his infernal trade, throw delicacy to the winds, give the plotter an hour's start, and denounce him to the police. Fast as he went, being winged by this resolution, it was already well on in the morning when he came in sight of the Superfluous Mansion.

Tripping down the steps, was the young lady of the various aliases; and he was surprised to see upon her countenance the marks of anger and concern.

'Madam,' he began, yielding to impulse and with no clear knowledge of what he was to add.

But at the sound of his voice she seemed to experience a shock of fear or horror; started back; lowered her veil with a sudden movement; and fled, without turning, from the square.

Here then, we step aside a moment from following the fortunes of Somerset, and proceed to relate the strange and romantic episode of THE BROWN BOX.