A cleaner at financial stockbrokers in the City, Sam (Sheridan Smith) is one of an invisible army enduring the suffocating grind of a zero hours contract. Mopping and sweeping and into the early hours, Sam’s life is the polar opposite to those she cleans up after. The traders gilded world of high finance, power, opportunity and luxurious excess, a stark reminder of what Sam and her friends do not have.

One night in the office, hidden in plain sight, Sam overhears an illegal trade being made; the initial shock giving way to the realisation she has direct access to highly confidential financial information. Inside information, which could afford her the break she so desperately needs.

With her life in free-fall, Sam has everything and nothing to lose. Armed only with a copy of Trading for Dummies and a gamblers nerve, this ordinary devoted and loving Mum makes a few tentative steps into the dark, dangerous and illegal world of insider trading, but just how far is she willing to go to turn her fortunes around?