As Ellie's fiftieth birthday approaches and her ambitions of a steady income, a successful career and an ascent of Everest seem as far away as ever, she begins to doubt she's capable of achieving anything at all. So when her best friend Mick suggests a gruelling cycle ride from Land's End to John o'Groats, she takes up the challenge. They opt for the scenic route which takes them along cycle paths, towpaths and the back roads and byways of Britain, unable to resist sampling local beers in the pubs they pass along the way. But as the pints start to stack up faster than the miles they're putting under their tyres, Ellie wonders if they'll ever make it to the finishing line...