Helen has come to Sherlock Holmes and John Watson to seek help in solving a murder. Her Twin sister Julia was killed two years prior. But when she was murdered it was a few days before her wedding and now since Helen is engaged she wants to make sure she is safe from whatever killed her sister. Helen suspected that her stepfather was the one who killed her sister. He had gone to India and when he returned he came back with a cheetah, a baboon, and India's most dangerous snake. There was no sign of forced entry and there was a fake bell pole so Sherlock decided to stay the night in the room where Julia was murdered. But then late in the night a noise was coming out of the phony bell-pole and to Sherlock's surprise it was India's most dangerous snake.