"Down on your knees, or you are a dead man!" I cried. "Confess everything, or I shoot you through the heart."
His courage had evidently forsaken him; he began to whimper and cry bitterly.
"Spare my life," he screamed. "I will tell everything, only spare my life."
"Be quick about it," I said; "I am in no humour to be merciful. Out with the truth."
I was listening anxiously for the wife's step, but except for the low hum of machinery and the splashing of the water I heard nothing.
"Speak," I said, giving the old man a shake. His lips trembled, his words came out falteringly.
"It was Wentworth's doing," he panted.
"Wentworth? Not the murdered man?" I cried.
"No, no, his cousin. The ruffian who has been the curse of my life. Owing to that last death he inherits the property. He is the real owner of the mill, and he invented the revolving floor. There were deaths—oh yes, oh yes. It was so easy, and I wanted the money. The police never suspected, nor did the doctors. Wentworth was bitter hard on me, and I got into his power." Here he choked and sobbed. "I am a miserable old man, sir," he gasped.
"So you killed your victims for the sake of money?" I said, grasping him by the shoulder.