Twenty-two-year-old sprinter Shania Edwards (Lenora Crichlow) is from the wrong side of the tracks. She's streetwise, tough and determined to compete in the world athletic championships. After qualifying for the 200 metres her dreams become a reality. The only thing standing in her way is rival Lisa Temple (Lily James), a posh, competitive girl with thriving ambition. But when placed on the same relay team Shania and Lisa are forced to overcome their differences and face adversity in a quest to take team GB to sporting victory.