The fifth season of Burn Notice starts out with a brief time jump from the events of the season four finale. Michael is working for the CIA and is basically on a revenge tour to take out the members of the organization that burned him in season one. Of course, the organization fights back, trying to frame Michael for murder, and the season ends up being a game of cat and mouse through the rest of the season as Michael tries to take down the last members of the organization. The season ends on yet another cliffhanger, this time with Fiona's fate hanging in the balance as the season ends.
For those who get the DVD set, the extras include a commentary track on the season finale "Fail-Safe" that includes Jeffrey Donovan, Bruce Campbell, and the show's creator Matt Nix, deleted scenes, a gag reel, an extended version of the episode "Army of One", and a featurette on the villains that have appeared on the show. So, there are a decent amount of extras if you like going through the bonus material.
Overall, the series continues to be good, but as the major "mystery" is resolved, answering the question "who burned Michael" the series does start to slow down. It does a good job introducing other story arcs to try and get viewers invested, which shows like "Twin Peaks" were not able to do effectively so that when the main mystery of the show was solved, Burn Notice had more staying power and did not end up fizzling out right away. While I do not think the show is as good as it was in the first couple of seasons, it is still strong in the fifth season and it sets up an interesting plot going into season six.