“Most willingly,” I said. “But if you fear a tragedy had we not better seek aid of the police?”

“The police?” she gasped, her face blanching in an instant. “Ah, no! Let us see for ourselves first. The police must know nothing—you understand. We must not arouse suspicion. I know they have returned, because at eleven last night, after they had left for Crowland, all the blinds were down, whereas now one blind is up and the sign is in the window.”

I saw that she was nervous and agitated, and that her suspicions were based, upon some secret knowledge. She believed that some hideous tragedy had occurred in that house of mystery in Harpur Street, and invoked my aid in its elucidation.

“You will not blame me,” she said in a hard voice. “I am culpable, I know, but when you have heard everything and are aware of the extraordinary circumstances which have brought me to what I am, I know you will forgive me and look leniently upon my shortcomings. Promise me you will,” she implored in deep earnestness, taking my hand in hers.

I promised, then she rushed into another room for a moment, and reappeared in hat and jacket. We drove quickly to that short, dismal street in Bloomsbury, and on approaching the house I saw that the dingy Venetian blinds were all down save at that window where showed the mysterious sign.

Having dismissed the cab, we both ascended the dirty, neglected steps, and rang. The bell clanged loudly somewhere in the regions below; but no one stirred. I was in favour of calling an inspector from the nearest police station and telling him of our suspicions, but she would not hear of it.

“No?” she cried, terrified at my suggestion. “The police must know nothing—nothing at all. If they did, then I myself must suffer.”

Her words were, to say the least, very curious. “No,” she went on, “we must try and get in ourselves—force the door or something.”

To force a door of that strong, old-fashioned character was difficult, I saw. The latch, too, was a patent one, with a well-known maker’s name on the keyhole cover—nearly new. To force a front door in a public street in the broad light of day without attracting attention is well-nigh impossible; therefore, instructing her to wait patiently where she was, so as not to arouse suspicion of the neighbours, I waited my opportunity, and then got over the locked gate and went down the steps to the kitchen door in the basement. That, too, was securely fastened; but on examination of the window it struck me that the shutters were only closed to and not bolted. Therefore, I called to my love to go back into Theobald’s Road and purchase a chisel, a glazier’s diamond, and a putty-knife, and bring them to me as soon as possible.

She obeyed at once, and until her return I crouched down beneath the front steps in a spot where the passers-by could not see me. On her return, a quarter of an hour later, she dropped down the tools to me as she walked past the house to the other end of the street.