THE MANSION OF MYSTERYBeing a Certain Case of Importance, Takenfrom the Note-book of Adam Adams,Investigator and DetectiveStart of Chapter 1 THE STORY OF A DOUBLE TRAGEDYThe young man was evidently in a tremendous hurry, and as soon as theferryboat bumped into the slip he was at the gate and was the first oneashore. He beckoned to one of the alert taxicabmen, and withoutwaiting to have the vehicle brought to him, ran to it and leaped inside."Do you know where the Vanderslip Building is?" he questioned abruptly."Yes, sir.""Then take me there with all possible speed.""Yes, sir."The door slammed, the taxi driver mounted to his seat, and off the taxistarted at the best rate of speed the driver could attain. The youngman sank down among the cushions and buried his chin in his hands