Before launching ourselves into the intrigues that build in this summer of 1811, it would be good to remember the universally acknowledged truth that a single man in possession of a good fortune must be in want of a wife. This truth, so dear to Jane Austen, will never be so obvious as it is in this fourth season which, this time, truly leads us from Longbourn to Pemberley.And yet one would be mistaken to think that it is the shortest paths that are...