Pick it up, pick it up, pick it up....

This series has everything, it's so compelling, I absolutely love it, and have already started my 3rd season 1- 4 rewatch!! But I find it sad that all the threads weren't realised by the end of season 4. They did a good job of rounding it off, but it was kinda forced, and too quick. Which is disappointing for such a high quality show.