THE YOUNG ADVENTURERS, LTD. "TOMMY, old thing!" "Tuppence, old bean!" The two young people greeted each other affectionately, and momentarily blocked the Dover Street Tube exit in doing so. The adjective "old" was misleading. Their united ages would certainly not have totalled forty-five. "Not seen you for simply centuries," continued the young man. "Where are you off to? Come and chew a bun with me. We're getting a bit unpopular here--blocking the gangway as it were. Let's get out of it.