For those who weren’t there, who didn’t live through the transition, it may be impossible to understand what it was like. Even for those who were, enough time has passed that perhaps the memory has dimmed under the successive tides of Sherlockian enthusiasm. But the fact is that 1974 is a watershed year in the history of Sherlock Holmes. The Great Detective went mainstream with the debut of Nicholas Meyer’s novel, The Seven-Per-Cent Solution.