In the film "Ronin," a mysterious briefcase with unknown contents becomes a coveted prize for both Irish terrorists and the Russian mob. To retrieve it, an Irish contact gathers a team of skilled mercenaries, known as 'ronin,' who are tasked with the perilous mission of securing the case. As tensions rise and loyalties are tested, the team embarks on a thrilling journey filled with danger and deception in their quest to reclaim the elusive briefcase.