You’ve seen Ocean’s 11, now get ready for Grimsby’s 4. After weeks at sea working for Grimsby's last remaining trawler, three friends return home to have the ultimate three-day-long celebration. However, they discover the company owner hasn’t been paying the workers and plans to shut the company’s doors forever. In order to save their livelihood and friends, the three lads attempt to carry out the greatest heist Grimsby has ever seen – what could possibly go wrong?