‘At the disposal of those to whom it belongs,’ Thérèse corrected me. ‘When the time comes to reclaim these millions I may be out of reach. That will not matter to you. All you will have to do is to keep the treasure in some safe hiding-place, and deliver it up to the first person who comes to you and pronounces in your ear three words.’

She bent her lips towards me and whispered three words of such notable significance that I was left in little doubt as to the purpose for which the mysterious hoard was being kept in readiness.

Although the light thus obtained served to relieve my mind of the fear that I was mixing in any vulgar swindle, yet at the same time it showed me that there were grave risks to be run, and that I might easily find myself in the meshes of the criminal law.

I again asked for time to consider. Madame Humbert’s sole reply was an offer of terms so liberal that it would have been quarrelling with my profession to refuse. She smiled with grim satisfaction as she read in my face that I gave in.

‘Then that is settled, monsieur,’ she remarked, preparing to rise. ‘I will only add that the sooner you get to work the better it will be for everybody.’

‘When do you propose to hand the millions over to me?’ was my natural question.

‘I do not propose to hand them over to you at all,’ she responded coolly. ‘You will take the money out of the safe in your own fashion, and without consulting me.’

I gazed at her in consternation.

‘You mean that I should steal this two hundred millions!’ I gasped.

‘That will be the best plan, I think,’ said Madame Humbert with an approving nod.