’It won’t be easy.  It would madden me, and it will be a far heavier burden for a man like you.  You have got to sink down deep into the life of the half-baked, the people whom this war hasn’t touched or has touched in the wrong way, the people who split hairs all day and are engrossed in what you and I would call selfish little fads.  Yes.  People like my aunts and Launcelot, only for the most part in a different social grade.  You won’t live in an old manor like this, but among gimcrack little “arty” houses.  You will hear everything you regard as sacred laughed at and condemned, and every kind of nauseous folly acclaimed, and you must hold your tongue and pretend to agree.  You will have nothing in the world to do except to let the life soak into you, and, as I have said, keep your eyes and ears open.’

‘But you must give me some clue as to what I should be looking for?’

’My orders are to give you none.  Our chiefs—­yours and mine—­want you to go where you are going without any kind of parti pris.  Remember we are still in the intelligence stage of the affair.  The time hasn’t yet come for a plan of campaign, and still less for action.’

‘Tell me one thing,’ I said.  ‘Is it a really big thing we’re after?’

‘A—­really—­big—­thing,’ she said slowly and very gravely.  ’You and I and some hundred others are hunting the most dangerous man in all the world.  Till we succeed everything that Britain does is crippled.  If we fail or succeed too late the Allies may never win the victory which is their right.  I will tell you one thing to cheer you.  It is in some sort a race against time, so your purgatory won’t endure too long.’

I was bound to obey, and she knew it, for she took my willingness for granted.

From a little gold satchel she selected a tiny box, and opening it extracted a thing like a purple wafer with a white St Andrew’s Cross on it.

’What kind of watch have you?  Ah, a hunter.  Paste that inside the lid.  Some day you may be called on to show it . . .  One other thing.  Buy tomorrow a copy of the Pilgrim’s Progress and get it by heart.  You will receive letters and messages some day and the style of our friends is apt to be reminiscent of John Bunyan . . .  The car will be at the door tomorrow to catch the ten-thirty, and I will give you the address of the rooms that have been taken for you . . .  Beyond that I have nothing to say, except to beg you to play the part well and keep your temper.  You behaved very nicely at dinner.’

I asked one last question as we said good night in the hall.  ’Shall I see you again?’

‘Soon, and often,’ was the answer.  ‘Remember we are colleagues.’

I went upstairs feeling extraordinarily comforted.  I had a perfectly beastly time ahead of me, but now it was all glorified and coloured with the thought of the girl who had sung ‘Cherry Ripe’ in the garden.  I commended the wisdom of that old serpent Bullivant in the choice of his intermediary, for I’m hanged if I would have taken such orders from anyone else.