“But I tell you, you have been marked down, Herr Mitter,” said Dr. Gottlieb sternly, “and that word has reached us from several quarters that you are now under the suspicion of the authorities. I have made this special journey to warn you.”It was toward 9 o'clock upon one stormy summer night, and two men were conversing together in the low, oak-panelled and beautifully furnished room of an old house perched high upon a lonely stretch of cliff upon the coast of Suffolk, between the towns of Aldeburgh and Southwold. Glasses, spirits and a syphon had just been placed before them and the soft-footed butler had glided noiselessly from the room. Had the curtains of the long windows not been closely drawn, under a fitful moon could have been seen the heaving waters of the dark North Sea. The sound of the waves came up faintly into the room.