(for Travel & Leisure) Late on a chilly afternoon, a cold rain is falling. It turns dark. The streets empty. The cobblestones are slick. A man seems to follow you. Suddenly, Stockholm—with its sunny summers, star-spangled winter nights, placid harbor, and beautiful blond youth—is recast as a secret, hidden, frightening place. “A day for murder,” says one of the tourists as we descend on Mellqvist Kaffebar. “This is it,” they whisper to one another—the café where Stieg Larsson …[Read more]