Ending his secondment to London’s Met Police, Roy Grace gets a tip-off about a county lines drugs mastermind operating out of Brighton. On his first day back in his old job in Sussex, he is called to a seemingly senseless murder.

Meanwhile, Meg Magellan finally has her life back together, five years after the car crash that killed her husband and their son. Her daughter, Laura is on her gap year travelling in South America and Meg misses her badly. Laura is all she has in the world. In between jobs, Meg receives a summons for jury service and she is selected for the trial of a major Brighton drugs overlord.

While Grace’s investigation draws him increasingly into the sinister sphere of influence of the drug dealer on trial, Meg arrives home to find a photograph of Laura, in Ecuador, lying on her kitchen table. Then her phone rings. A fearsome, threatening stranger is on the line. He tells her that if she ever wants to see Laura alive again, it is very simple. At the end of the trial, all she has to do is make sure the jury says just two words … Not guilty.