一位前摩托越野冠军和陆军退伍军人，现在照顾着他年幼的弟弟。身无分文的他同意在北海接几个神秘的非法包裹。结果遭受双重背叛，弟弟失踪，他和他的旧摩托车展开了一场暴力的夜间冒险奇遇，穿越英格兰北部的铁锈地带。

When John ‘Ludwig’ Taylor’s (David Mitchell) identical twin, DCI James Taylor, disappears off the face of the earth, John takes over his brother’s identity in a quest to discover his whereabouts. John has never married; never had a family and never really ventured further than his own front door. Without a computer, mobile phone or even a television, he lives in quiet solitude, designing puzzles for a living, under the nom-de-plume of ‘Ludwig’. This genre bending detective series follows full-time luddite, John 'Ludwig' Taylor, as he assumes the identity of his missing twin brother in a bid to track him down and bring him home. However, filling the shoes of your identical twin is one thing - when your twin also happens to be a successful DCI leading Cambridge’s busy inner-city major crimes team the stakes are much higher. John may be a master of all things cryptic, but can he crack the biggest puzzle of his life?

这部模拟纪录片放在库鲁普FM（Kurupt FM）的麦克风后面，库鲁普调频是伦敦西部第二大最受欢迎的海盗电台，每场节目最多可接收八条短信，并播放英国车库里最好的低音鼓。该电台于2002年由MC狙击手和DJ Beats共同创办，现在已经建立了超过100人的追随者，并吸引了BBC的关注，BBC正在制作一部关于Kurupt FM幕后人员生活的纪录片

自从海盗电台结束以来，“库鲁普特调频”男孩们的生活一直很平静，但一切都即将改变。他们收到消息说，他们的一首歌在日本的一个流行游戏节目中被使用了，他们的音乐正在影响数十万人——终于到了享受名利双收的时候了。男孩们开始了他们的国际明星之旅，但日本真的准备好接受“库鲁普特调频”了吗？

同一场婚礼竟然出现两个版本。山姆·克拉弗林饰演的杰克身为新娘的哥哥，得轮番应付火大的前女友（芙蕾达·苹托饰），一位怀有秘密的不速之客，一颗被乱放的安眠镇静剂，以及当年追不到的梦中情人（奥莉维亚·玛恩饰）。一场婚礼，两样结局。