American expat Mickey Pearson has built a highly profitable marijuana empire in London. When word gets out that he's looking to cash out of the business, it triggers plots, schemes, bribery, and blackmail in an attempt to steal his domain out from under him. Meanwhile, crafty private investigator Fletcher approaches Mickey's right-hand man, Ray, with an offer to sell his boss's secrets for a hefty sum. Through a series of recounted tales and flashbacks, Fletcher unveils his extensive findings to Ray, attempting to shake him down.

The potential sale of Mickey's cannabis business attracts a mix of seedy figures from various echelons of society, including ambitious gangsters, underhanded billionaires, and trigger-happy youths. As each party attempts to outmaneuver the other in a high-stakes chess game of deceit and power, the web of lies and treachery expands. Mickey and Ray must navigate this dangerous underworld to maintain control of the empire Mickey has spent years building, while foreseeing and outwitting the myriad of threats closing in on them.