Stu's stag do in South America goes bad when Greg collapses at customs and is found to be full of cocaine. Arrested, the group are taken to an island prison run by cocaine-smuggling siblings, Selma and Branco. Things go from very bad to much worse.

Under The Man's instruction, Stu gets the gang jobs in the prison coke factory while Hugo works a special job for Selma - the assassination of her brother at a dinner being thrown for their boss. Things go awry. Stu's betrayal unspools. Blood spills.