But they fail in their efforts to avoid inviting Ruth's intense brother The Machine McDonald.
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So she asks his best man Davin Scott to plan a stag getaway.
Continue: It's usually the bride that enjoys organising every little detail for their wedding, but in Ruth and Fionnan's relationship, planning the nuptials has become the only thing that guarded perfectionist Fionnan thinks about.
However, it is soon revealed that Ruth's insane brother nicknamed The Machine will be joining Fionnan and his friends - a fact that even makes Davin consider calling off their adventure.