Part One of the 3rd Season Opener picks up where season 2 left off: Nancy is staring down the barrel of five guns as she desperately tries to find her drugs to salvage her deal-gone-wrong and/or survive. Silas' run-in with Celia and the police causes his car, with its precious cargo, to fall into the wrong hands; U-turn buys Nancy's debt from the Armenians, meaning she has to deal with him now; Kat abandons Shane at a diner, but at least she leaves him the van; Celia does something for Nancy's own good that may kill her - literally.
In part 2 of the third season opener, Nancy's plan to salvage her pot from the pool fails, so she turns to the only person who can help her; Nancy and Heylia have it out over the Armenians' involvement in her deal; a surprise visit to her old house shows Celia how little she is missed; Andy continues his desperate search for Shane; Heylia bails out Conrad, but leaves Nancy still on the hook with U-turn.
Nancy has a family meeting where everyone tries to figure out how to come up with the money she owes U-Turn. At the bank Celia learns that Isabel is her greatest asset, a cash cow, and that she needs to improve her mother-daughter relationship. Andy learns that having lost two toes is not enough to get him a release from military service. Nancy goes to Doug and tells him to sell all her remaining stocks and bonds, but he tells that everything was sold when Nancy needed money for opening the bakery. She's broke. Uh-oh.
U-turn continues to drag Nancy deeper into his world; Sullivan courts Doug and Celia for support of his plans; Andy goes to strange lengths to hide from the military; Nancy puts Shane in a summer school program in Majestic; Nancy reluctantly lets Silas sell for her, but he does well; Conrad and Heylia seem to have their own mysterious plan for getting rid of U-turn.
U-turn is determined to groom Nancy as his lieutenant, while kicking Marvin to the curb; Doug's jealousy is in full bloom as Sullivan courts Celia; Sullivan asks Nancy to throw a party for Agrestic's movers & shakers, leaving her to figure out what to do with U-turn's trunk; while doing community service at a senior center, Silas meets Tara, who has a very interesting way of getting close to Jesus; an exercise run into the hills reveals a vulnerability in U-turn, and Marvin takes advantage of it.
While secretly attending Peter's funeral, Nancy becomes very interested in Peter's ex-wife; Andy uses his foot injury as a way into the fetish porn world; Celia is still self-conscious after her reconstructive surgery; Shane and Isabel bond; the two Mrs. Scottsons finally meet face-to-face.
After a rocky start, Nancy befriends Valerie; while riding his bike, Dean is forced off the road and ends up in the hospital; because of Dean's accident, Celia has to cool things off with Sullivan; Doug declares war on Sullivan over his canceled golf membership; Silas talks Nancy into letting Tara sell for her; Nancy talks Conrad into taking Silas under his wing; the day comes to celebrate the merger of Agrestic and Majestic, but Doug's vengeful act gives him his own reason to celebrate.
Nancy gets a surprise call from the DEA - to give her Peter's pension and insurance money; Nancy is torn between giving the money to Valerie or bailing Doug out of the mess he has made through his creative accounting; Dean is enjoying making Celia's life miserable as she is forced to take care of him; Conrad continues to teach Silas the growing business; Nancy's friendship with Valerie hits the skids when Valerie finds out about the insurance money; an unannounced visit to Sullivan's office by Celia reveals something shocking to her about his relationship with Nancy.
Valerie hires a private detective to spy on Nancy; after seeing Nancy and Sullivan together, Celia is determined to find out about "Aguatecture"; Doug and his fellow Agrestic council members lose their jobs; Silas finds out Tara is seeing other guys; Shane installs a surveillance system, just in time to catch a spy at work; Nancy finds out that Celia knows way too much about her business.
Knowing what she knows and facing a mountain of bills, Celia wants "in" on Nancy's business; a fire marshal inspection causes a small panic at the grow house as Conrad decides to move it; Andy has a thing for a biker chick, but the chick's brother has a deal to offer Nancy; at a vulnerable moment, Conrad and Nancy connect at a new level.
Doug tries to hide the stolen Majestic Church cross at Nancy's house; Nancy tries to do business with Andy's biker friends; after getting her revenge on Sullivan, Celia officially crosses over to the dark side; Silas and Tara reconcile, but later he gets beaten up; Shane adopts a troubling way of coping with his fears.
After Silas' run-in with the Bikers, Nancy seeks protection from the Mexicans, but at a steep price; Celia seeks help from Doug to launder her money; Shane continues to see his Dad, although he's dead; while doing aerial thermal scans, the DEA makes a potentially disastrous discovery for the gang; Guillermo's idea of protection may spell disaster for the whole town.
Season 3 ends with the entire town of Majestic, including Agrestic, facing destruction from a wildfire set by Guillermo and his Mexican friends; Tara and her fanatical friends try to rescue the cross from the makeshift grow house; When the police find out what's been growing there, all fingers point to Celia; Nancy decides it might be the best time to leave Majestic, and she takes steps to make sure it's for good.