The Speckled Band

For a moment I thought I heard a whistling. Then I heard a thud. It sounded as if a heavy piece of iron had fallen to
the floor.'Then a key turned. I stood frozen with fear. Julia staggered out of her room. She stretched her arms out to me, her eyes wide open with fear.'

After her sister Julia dies suddenly, Helen Stoner worries that she is the killer's next target. With her last words,
Julia insisted that the 'speckled band' murdered her. Can Sherlock Holmes and Dr Watson discover the identity of the speckled band before Helen falls victim as well?'