Builder Harry Hambridge is a down-on-his-luck paddy living in London. In one day he loses his job, father and beloved pet hamster, Mouse. On returning home to bury his father, he finds a statement from his Grandfather, claiming that it was he who raised the flag over the GPO during the 1916 Rising, which now hangs upside-down in an army barracks in England. Too long used to the mockery of his life, he sets out with his motley crew to find that “fecking flag” and maybe his passion for life along the way.

哈里汉·布里奇是一个建筑工人，过着平淡无奇的生活。但他心中总是对自己的状态感到不甘，最近运气不佳的他更是倍感苦闷。但如今一件刺激事发生了——他发现自己的父亲曾在1916年爱尔兰复活节起义中立旗，而这面旗帜现在正悬挂在一个英国军营中。面对一件具有如此重大象征意义的父亲遗物，哈里开展了一个疯狂的计划：他要把旗帜从军营拿到手。