Bridegroom Fionan (Hugh O'Conor, Chocolat) is a self-confessed metrosexual ready for marriage, but not interested in the stereotypical male excesses of a stag night. It's simply not for him. Instead, he would be happy attending his fiancee Ruth's (Amy Huberman) Hen night, which of course is totally out of the question. An unusual predicament by any measure, Ruth asks best man Davin (Andrew Scott, TV's Sherlock) to break with tradition and organise something suitable for them to do in the great outdoors - a bachelor weekend camping in the wilderness. But when Ruth’s wildly infamous brother, ‘The Machine’ (Peter McDonald) catches on, what starts out as a tame walk in the woods turns into a madcap dance with mother nature. Never one to miss out on a good time, he tracks them down, throws their compass to the wind and guides them on a one-of-a-kind journey of self-discovery and merry chaos in the unfolding wilds of rural Ireland.