Once a strange lady appeared next to Sherlock's house.
The woman is named Mrs Helen.She is stressed while talking to Sherlock about her problem.
Mr. Holmes and Dr. Watson arrive at Leatherhead and got a cab to Helen Stoner's house.
In Helen's house,in Dr. Roylott's room,they found a small saucer of milk.
Dr. Watson and Mr. Holmes stayed in the room .They spotted Helen shining a bright light in the window.They saw a light in the ventilator,a sigh that Dr. Roylott is up.Suddenly Dr.Watson slashed the rope with a walking stick.
Mr. Holmes rushed to Dr. Roylott's room.Where they found Dr. Roylott sitting on the chair dead with the poisonous snake around his neck.