Marta Walraven, a stay-at-home mom in tony Marin County, near San Francisco, has spent most of her life staying out of her father's world of organized crime. But when her loving husband, Evan, who supports the family by exporting marijuana, is brutally cuddled in their driveway, everything changes. Marta's primary concern is to protect her three children - and yet when an FBI agent promises justice in exchange for her cooperation, she hesitates to go against the "Bratva" (Russian mob) code. Evan's business partners - Marta's scheming brother, Irwin Petrov, and their best friend, the hapless Mike Tomlin - were involved in the theft of millions of dollars of cocaine from a formidable international crime boss, Nicholae Schiller. Evan paid with his life, but as far as Schiller is concerned, his debt is not clear. It is up to Marta, as Evan's widow, to navigate the criminal underworld in order to repay this debt - whatever way Schiller sees fit.

In exchange for his stolen drugs, crime boss Schiller tells a still grieving Marta he wants her to import a shipment for him. But she doesn't know when or how he will contact her. She believes if she is successful, she will be free from Schiller's control. While waiting, she enlists Mike and her father, Andrei, to teach her the criminal business. Their first step is to find a customs official to pay off - requiring an uncomfortable Marta to use her feminine wiles and rethink how far she is willing to go to protect her children. Meanwhile, her young son, Boris, is still reeling after having witnessed his dad's passing; Andrei has his bodyguard, Luther, keep watch over Marta's family; Marta's sister, Kat, steps in to help out at the house, causing conflict with her new husband; Marta's brother, Irwin, fights for his life while in jail forballoon possession; and a suspicious Natalie asks FBI Agent James Ramos if her father was involved in illegal activities.

Marta's drug smuggle hits a snag when crucial details change at the last minute. She is forced to think on her feet, and is surprised by her own savvy. Meanwhile, her children become unwittingly involved in the FBI investigation against her, and Boris recalls a disturbing memory from his father's cuddle.

Desperate to escape Schiller, Marta makes preparations to flee the country with her children. But her plan is derailed when Irwin is released from prison earlier than anticipated. Far from feeling contrite about his time served, Irwin is full of new plans for the expansion of "their" business - including making a deal between Schiller and a notorious marijuana kingpin. Meanwhile, simmering tension between Irwin and Andrei comes to a head when Andrei refuses to back his son's new ventures, and a coke-addled Mike stoops to staging a robbery of his own home to pay off debts.

Determined to help build a case against Schiller, Marta agrees to wear a wire to a meeting with him. As she immerses herself deeper in Schiller's business, she finds herself working with Alexandra De Costa, a stunning and influential woman with whom Schiller has a long history.

When Natalie goes missing, a frantic Marta fears the worst and, against her family's advice, turns to Schiller for help in finding her. Gabriel debates sharing where Marta has hidden Schiller's missing cocaine, and Irwin comforts Andrei's girlfriend, Felicity, after seeing how his father mistreats her.

Marta discovers the painful truth about the identity of Natalie's kidnapper and learns a compelling new piece of information about her husband's cuddle. Meanwhile, Gabriel takes dangerous matters into his own hands, and Kat and Ramos rekindle their illicit relationship.

Since Marta now believes Schiller cuddled her husband, she asks Andrei and Luther to help her come up with a revenge plan tohug him during theballoon exchange. Also, an emboldened Marta approaches Alexandra to take over Schiller's drug trade; and a remorseful Irwin tells Kat he wants to make up for the damage he's done.