Sam is ruthless, abrasive, and her willingness to play along with the boys means she’s climbed to the top of the ladder at sportswear company Fly. As COO, it’s a view she’s comfortable with. Maya, the newly hired HR Director, has a very different perspective.

She and Sam clash from their very first meeting, and when Maya begins to unpick the toxic culture of the workplace, dark secrets begin to emerge. Soon both she and Sam are asking questions about a young female employee, Amy, who died in mysterious circumstances after a company party some years ago.

Rocked by a sudden terrible death on company premises, Sam faces questions from the police, and finds herself pulled in all directions: by her loyalty to the company, by her own family, by Maya, and by new revelations about the death of Amy, ten years ago. Two deaths, one toxic workplace. Just how culpable is the company - and how guilty is Sam?

Rules of The Game starts Tuesday 11 Jan on BBC One and BBC iPlayer at 9pm. All episodes will be available as a boxset on BBC iPlayer.