"Rum Kings" is a historical drama set in 1920s London, following the entrepreneurial journey of British-Irish brothers Declan, Ezra and Liam Blackwood. Exploiting their wartime connections, the brothers become renowned suppliers of top-quality rum during the American prohibition era. Operating in the dangerous realm of illegal trade, they orchestrate a plan to smuggle their prized product into American speakeasies. The brother's sharp business sense propels them to the forefront of the rum trade, establishing their reputation as premier purveyors. However, their success is not without consequences. The brothers must learn to navigate the obstacles that threaten to dismantle everything they have built to safeguard their expanding empire in the shady underworld of illicit operations.