Sam, a struggling mother trying to rebuild her life, takes a cleaning job in the City of London, where she accidentally stumbles upon information about a lucrative illegal stock market, upending her life.

Sam's money-making scheme begins to bear fruit, but complications soon arise. When a wiretap is discovered and his source of information is cut off, Sam enlists the help of Mina, a fellow janitor, to pull off a dangerous scam.

Sam and Jess are questioned by the company's compliance team, and Jess tells Sam that she has made a shocking discovery about Blake. Alice learns more about her parents' separation and her mother's gambling addiction.

Sam promises Suwannee that she can take Blake's place. That means she needs to get secret information about an upcoming real estate deal and pull off the biggest scam ever with the help of Jess and Mina, but things don't go as planned.

Suwannee puts Sam in charge of a large investment, and she goes to great lengths to make the risky job a success. Dave senses a change in Sam as she enjoys her new persona, and Glynn learns that Sam is still struggling financially.

[Final Episode] Risking losing everything, Sam faces the dire consequences of his actions. Out of options, Sam must confront a network of insider traders.