On Stan's orders, Mary arrives at Peter's auto dealership to turn in her beloved-but-too-conspicuous Mustang & learns that newly-engaged Brandi has joined the sales team. She's a natural saleswoman, but her fledgling career & newfound confidence are soon jeopardised when six luxury cars go missing from the dealership, & Brandi's record puts her at the top of the Albuquerque PD's suspect list. To add insult to Grand Theft Auto, Peter's parents make it clear that they don't exactly trust their soon-to-be daughter-inlaw's intentions, & the tension is driving a wedge between Brandi & Peter. ...

Pregnant or not, Mary Shannon has never been very good at unwinding. Which is why, in an attempt to force relaxation on her, Stan & Marshall hatch a plan to get her out of town. With Oscar riding shotgun, Mary heads into the desert to deliver a message to one of Marshall's witnesses, a new age alpaca farmer who just might have some insight to offer into Mary's current situation. & with a file full of prospective adoptive parents & some tough decisions to make, Mary could certainly use a little guidance, even if she is reluctant to heed the advice of a New Mexico mystic. Or a dog. ...

When a decorated soldier witnesses his superiors selling arms to the enemy & steps forward to do the right thing, he soon finds himself out of the Army, shipped off to Albuquerque, & in the Witness Protection Programme. Like most witnesses, John & his wife Sue have some trouble coping with the changes, but unfortunately their problems run deeper than adjusting to life off the base: John is suffering from Post Traumatic Stress Disorder, & his psychological state is putting the case & the witnesses in jeopardy. ...

Mary proves it takes one to know one when she visits a mafia-mistress-turned-witness named Grace Haddik, & discovers what both Marshall & Stan missed: Grace is pregnant. Very pregnant. Now that Grace's bun in the oven is out in the open, Mary & Marshall must do their best to keep mother & baby safe. Which in Mary's case means posing as Grace's life partner & holding her hand through the birthing process. ...

Brandi's wedding day has finally arrived, & Mary finds herself torn between two duties: job & family. The one day of the year she can't be at work, Maid of Honour Mary is called in to testify about her role in the sting on arms dealer Julian Conran, & she can only hope to get to the courthouse & the church (or in this case, the country club) on time. Complicating matters is the fact that Mary is confronted with two rather unwelcome visitors: her ex-husband (and baby daddy) Mark, & Ronnie Dalembert/ Mc Intyre – the con man Mary met & detested only a few months earlier. While Mark comes through for Mary, Ronnie manages to screw things up for everyone yet again. Only this time, things get really ugly for the Wit Sec team when, while escorting Ronnie to give his testimony, Mary, Marshall, Stan & Delia find themselves trapped in the courthouse & ambushed by assassins. ...

Love is in the air in Albuquerque, as Mary is forced to tend to a lovesick witness pining for his childhood sweetheart. When Jimmy Hart finds out the au pair company he's been working for is actually a front for a human trafficking ring, he's appalled—and ready to testify, no matter the personal cost. But when he learns that prosecutors are trying to build a case against Winnie, his lifelong best friend & crush, Jimmy stonewalls. He'd rather go down himself than hang her out to dry. ...

Mary is surprised to get a call from longtime witness Sharon Harris, a drug dealer-turned-devoted-PTA mom who's stayed out of trouble for years. & when she meets Sharon, Mary is in for two unpleasant new surprises: one, there are no homemade cookies in sight; & two, Sharon's teenage daughter Beth has somehow gotten her hands on her mom's old mugshot & is about to unravel the truth about Sharon's past. ...

When Mary busts Marshall's witness Ronnie Mc Intire, an allegedly reformed con man accused of bilking money from unsuspecting seniors, she's hoping to get him kicked out of the programme & packed off to prison. Unfortunately for Mary, the FBI is onto Ronnie too, & they're eager to take advantage of his access to notorious arms trafficker Julian Conran. Since Conran happens to have a thing for busty blondes, Mary soon finds herself strapped into a push-up bra & going undercover in an effort to protect Ronnie & get the goods on Conran. While Mary might have been able to see through Ronnie's lies from day one, when her ex-husband Mark shows up at her door her feelings are less clear. ...

For every witness, adjusting to a new life is difficult. But for Sarah & Yonni Petershwim, the challenge is bigger than just remembering a new last name & getting used to a different climate. For this old-order Amish couple from Pennsylvania's Dutch Country, New Mexico might as well be Mars. After Sarah witnesses the murder of a farmhand & agrees to testify against the bikers who killed him, she & her husband reluctantly relocate to Albuquerque. The sudden exposure to modern life, with all its technology & temptations, proves challenging. & as Mary & Marshall soon discover, there's more to this couple's problems than trouble operating their new-fangled television set & cell phones: they're hiding something, & whatever it is could turn out to be deadly. ...

If there's one thing witnesses & Wit Sec inspectors share, it's daddy issues. Or so Mary & Marshall realise when they meet witness Ben Kulpak. Angry with their father for the mistakes that landed him in this mess, his grown kids refuse to come into the programme with him. But when Ben winds up in the hospital & the Lithuanian mobsters after him manage to track down his kids, everyone's plans change. Tom & Cecile agree to join the programme & soon arrive in Albuquerque, but unfortunately it's a less than joyous family reunion — in part because there's some deserved resentment on their side for his wrongs as a father, & in part because it turns out that Ben has another secret he's trying to keep from his kids: he's dying. ...