There seems to be some secret in the mechanism that I am unable to guess at, though I served a year in Chubb's before I joined the police.

It is a combination lock of seven letters; but there seems to be a way of locking even the combination.

It is one of Chatwood's; I shall call at their place and find out something about it." Then turning to the Doctor, as though his own work were for the present done, he said: "Have you anything you can tell me at once, Doctor, which will not interfere with your full report?
If there is any doubt I can wait, but the sooner I know something definite the better." Doctor Winchester answered at once: "For my own part I see no reason in waiting.

I shall make a full report of course.

But in the meantime I shall tell you all I know--which is after all not very much, and all I think--which is less definite.