If you watch an episode from the beginning, every single one begins with a fifteen second rundown of the plot. He's a spy who has been blacklisted and told that if he tries to leave Miami they'll kill him. So, while he's trying to find out how to unblacklist himself and get back to being a spy, he takes on clients and fights bad guys with the help of a former IRA bomber girlfriend, an ex-FBI/ex-Navy Seal buddy (Bruce Campbell), and sometimes his mom (who is just a mom, not a former spy or fed or anything).
The best elements of the show is when they explain stuff MacGyver style. Like in the first episode when he's running off a drug dealer he explains how most people who spend good money on a strong door and locks often forget to reinforce the wall around the door, he knocks on the door, waits, then shoots the drug dealer in the leg through the thin wall.