With an exclamation of annoyance Mr. Martin turned once more to the letter. “Dear Sir, I venture to address you upon a subject which will no doubt interest you,” it ran. “I have recently acquired a lease of the premises No. 407, Praed Street, which I understand, were in your occupation up till some fifteen years ago. Since you vacated them, these premises have been occupied by a clothier, who did not require the extensive cellarage, which was boarded up. In the course of certain alterations which I am having made to the premises, the entrance to the cellars has once again been opened. In the course of my investigations I have made a most interesting discovery in the small cellar beneath the back office.