As their partnership reaches new heights, Walt and Jesse begin to see the extremes of the drug trafficking business. Their trademark blue meth is making them rich, but it's getting more difficult than ever for Walt to conceal the truth from his wife Skyler, his son Walter Jr., and his DEA agent brother-in-law Hank. Walt struggles to maintain control of his life as he contends with vicious drug dealers, an increasingly distant wife and son, the impending birth of his daughter, and a strung-out business partner – all while battling terminal lung cancer.