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Once Ms Stoner had left, Sherlock Holmes and Dr John H. Watson are visited by Ms Helen Stoner%u2019s stepfather, Dr Grimesby Roylott who tells them to keep out of his personal business.
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Ms Helen Stoner (a twin and also step daughter of odd man) comes to Sherlock Holmes about the mystery of her twin sister%u2019s death and the strange whistling sound she can hear now she has moved into her dead sister%u2019s old room.
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Sherlock Holmes and Dr Watson travel to Reading from London to visit Ms Helen Stoner in her and her stepfather%u2019s manor house.
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Once Sherlock and Dr Watson are at the house, they inspect the room that her sister died in and the other rooms in the house for clues.
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They discovered that the ventilator and bell-rope were both dummies and that the ventilator opened out into the next-door rooms (her stepfather%u2019s room and her room) and that the bed was clamped to the floor.
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Sherlock investigated Dr Grimesby Roylott%u2019s bedroom for clues and quizzed Ms Stoner on some of the strange objects purpose and why they were in there.
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They stayed up during the night and waited to find out the cause of Ms Helen Stoner%u2019s twin sister, Julia death and surely soon Helen Stoner%u2019s death as well.
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A minute later the creature (an Indian swamp adder %u2013 one of the deadliest snakes in India) turned back on his master (Dr Grimesby Roylott) and killed him.
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Sherlock and Dr Watson were awoken by the sound of something in the ventilator and so they gave the creature a fright so that it turned back on itself in the ventilator.
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Sherlock Holmes and Dr Watson discovered the mystery of Ms Julia Stoner%u2019s death and the speckled band and saved Ms Helen Stoner%u2019s life.