The great detective, Sherlock Holmes, is dying from a highly contagious tropical disease called Tapanuli fever. Dr. Watson is shocked when he hears about his friend's illness. He travels to examine him, but Holmes refuses his help. Instead, a man called Culverton Smith arrives after being called by Watson. He is not a professional doctor but knows more about the disease than anyone else. Why is this illness so serious and what caused it? Will Smith be able to find the source of infection and cure the famous detective? Is Holmes sick at all or is it all just an act played by him for some secret reason? You can find all the answers in this thrilling Sherlock Holmes story.