Mary's new witness Adam Wilson is blowing the whistle on his boss, a well-connected military contractor, & the stress is taking a toll on Adam's psychological health. When Adam's paranoia & hallucinations worsen, Mary & Marshall realise their witness might have gone off the deep end. But as they attempt to get Adam back to dry land & protect his justifiably alarmed teenage son Joey, Mary & Marshall begin to wonder if there might be some truth behind Adam's wild claims. After all, just because you're crazy doesn't mean they aren't after you. ...

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. ...

When Dr. Amit Kishore, a well-respected neurosurgeon, runs afoul of the law by conspiring with the Indian mob to commit Medicare fraud, he cuts a deal & enters Witness Protection with his family. Unfortunately, the now-Kumars are not exactly one big happy family, & not long after their arrival in Albuquerque, the formerly docile Mrs. Kumar makes a shocking request: a divorce. Things get messy for the Wit Sec team when Ashok & Sudha (as they're now known) battle over the children, & an arrogant U.S. Attorney with a grudge against Stan pressures the team to keep the feuding couple under control. Though Mary & Marshall do their best to help the Kumars find common ground, it's anyone's guess as to how this story will end. After all, as Mary knows better than anyone, life is full of surprises: sometimes you get to start over, & sometimes you get pregnant. ...

It's a story as old as time, or at least as old as the story of Cain & Abel: two brothers turn out as different as can be, & can't seem to find a way to get along. Throw in a connection to an inter-state fraud operation, an FBI bust, & a subsequent relocation to Albuquerque, & you've got family drama of Biblical proportions. Meet George & Billy Stone. George is fastidious, Billy is fast-living. George is upstanding & responsible. Billy is... a mess. & now, thanks to Billy's involvement with some unsavory counterfeiters & a case of mistaken identity, both brothers have been dropped in Mary & Marshall's backyard. Billy adores his brother & is desperate to stay together; George's feelings towards his ne'er-do-well younger sibling are less warm. Even if Mary & Marshall can keep the brothers from killing each other, they've still got the angry thugs back in California to worry about. ...

With Mark co-parenting, Jinx playing babysitter & Brandi day-trading with their half-brother in Florida, Mary is finally ready to return to work for the first time since having baby Norah six months ago. WITSEC's latest witness is Ivan Gunter, a college student & a member of an elite eating club that runs a gambling website. When Ivan witnesses Brockton Jr., the president of the eating club, murder a fellow member, Ivan knows that he & his mother are in serious danger & in need of WITSEC's help. ...

With Jinx out of town & Mark busy with a last minute business trip, Mary has no choice but to head to work with Norah in tow. But when Mary arrives, Delia points out the obvious: Mary can't be with Norah & a witness at the same time. Fortunately, as Mary soon learns, Delia, Stan & Marshall make pretty good babysitters. Mary's first meeting of the day is with Beth Wilcox, a doll collector who entered the programme five years ago. Beth's landlord has been threatening to post a video of her on the Internet, which Beth & Mary both know could be a problem for Beth. Mary sends Delia to evaluate the situation at Beth's apartment so that she can check in on Carlos Ramirez, an alpaca farmer, who is worried someone from his previous life may have spotted him in town. ...

WITSEC's latest witness is Eddie Fredericks/ Williams, a former Navy Seal who, along with his partner, Bo, has been pretending to be an FBI agent in order to help track down individuals for an Indonesian warlord. After the FBI catches Eddie, WITSEC agrees to protect him while he serves time, but things go awry when Eddie escapes from the WITSEC office – on Marshall's watch. Using Delia's car, Eddie makes his way to a nearby reservation. When the team finds Delia's car, it's burned & Eddie is gone, so Mary, Marshall & Heather, a Native American detective who seems to have a thing for Marshall, head out on horseback to find Eddie. The search lasts longer than expected, so Marshall has to cancel plans with Abigail & Mary must ask Mark to babysit Norah for the night. ...