It is a grey Saturday morning in August, 1921, and the leaden skies of Birmingham rain down upon a barge full of young Cadbury workers, heading off from Bournville for a week at Camp School. Excitement is high as the itinerary is revealed, but none can foresee the distant milestone besides which two of their number will stumble across a mysterious object. Their discovery sparks an adventure of intrigue and danger, humour and romance, interlaced with a fascinating historical travelogue, through which the quest to unravel the Bournville Barge Mystery unfurls like the weed-choked Warwickshire canal upon which they travel.