One of my favorite professors, the late Ian Watt, taught that there were four great myths of modern individualism: Faust, Don Juan, Don Quixote and Robinson Crusoe. This always got me wondering which, if any, pop-culture heroes might endure in the same way. James Bond? Luke Skywalker? The Avengers? C'mon. In fact, there's only one who I feel sure will last — Sherlock Holmes.