NICK CARTER STORIES _Issued Weekly. Entered as Second-class Matter at the New York Post Office, by_ STREET & SMITH, _79-89 Seventh Ave., New York. Copyright, 1915, by_ STREET & SMITH. _O. G. Smith and G. C. Smith, Proprietors._ Terms to NICK CARTER STORIES Mail Subscribers. (_Postage Free._) Single Copies or Back Numbers, 5c. Each. 3 months 65c. 4 months 85c. 6 months $1.25 One year $2.50 2 copies one year 4.00 1 copy two years 4.00 =How to Send Money=--By post-office or express money order, registered letter, bank check or draft, at our risk. At your own risk if sent by currency, coin, or postage stamps in ordinary letter. =Receipts=--Receipt of your remittance is acknowledged by proper change of number on your label. If not correct you have not been properly credited, and should let us know at once. =No. 154.= NEW YORK, August 21, 1915. =Price Five Cents.= THE MASK OF DEATH; Or, NICK CARTER’S CURIOUS CASE. Edited by CHICKERING CARTER. CHAPTER I. A MYSTERIOUS ROBBERY. “Nick Carter will solve the mystery. No crime is too deep for him. He’ll ferret out the truth and run down the rascals. He will recover your lost treasures, too, Mr. Strickland, one and all of them, take my word for it. If there is one man on earth who can accomplish it, Nick Carter is that one man. So pull yourself together, sir, and face this calamity man fashion. Carter already is on his way here, and he soon will fathom this outrageous and----” Nick Carter did not wait to hear more. He pushed open the door through which he had heard the above remarks, observing that it was ajar, and he entered without ceremony the apartments of the man to whom they had been addressed. They denoted that he was on the threshold of an extraordinary case, one shrouded in mystery and involving a great loss, and the scene within seemed to warrant all that he had overheard. The entrance hall through which he had passed led into a beautifully furnished parlor overlooking Fifth Avenue. It was one of the front rooms of an apartment occupying the entire second floor of the spacious and magnificent old Vanhausen mansion, turned to other than strictly private residential uses since the encroachment of commercial interests upon that part of the fashionable New York thoroughfare. A slender, strikingly pretty girl of eighteen sat weeping in one of the richly upholstered armchairs. Her fair face was of an artless, winsome type, evincing girlish innocence and that sweet and sensitive nature which none can resist. A light complexion and glistening golden hair, crowning a shapely and perfectly poised head, told plainly that she was of German extraction.