In which Sherlock Holmes and Dr. Watson delve deeper into the curious circumstances surrounding Sir Henry Baskerville, including the mysterious disappearance and reappearance of a boot and the shadowy figures trailing the heir in London. Holmes, recognising the complexity and peril of the case, entrusts Watson to accompany Sir Henry to Baskerville Hall, whilst he remains in London to tend to other pressing matters, pondering the tangled threads of this singular affaire.