The movie County Lines follows the story of a single mother named Sarah, who lives with her young son and struggles to make ends meet. Facing financial difficulties, Sarah's son Tyler takes up an offer from a local dealer named Simon to sell drugs. Soon, he finds himself recruited into a nationwide drug-selling operation, known as 'County Lines'.
Tyler becomes entrenched in this dangerous enterprise, where he must face violent rivals, corrupt authorities, and the harsh realities of life on the streets. Meanwhile, Sarah struggles with her mounting worries and tries to intervene to save her son from the dangerous path he has embarked on.
As the operation grows more sophisticated and Tyler becomes more deeply involved, the levels of danger and risk escalate, and Sarah must confront the harsh realities of her son's involvement in this dangerous world. The film explores the devastating impact of this illicit enterprise on vulnerable children and their families, highlighting the urgent need for action to tackle the widespread nature of this problem across the UK.