Robbie discovers a mysterious message in a bottle on the Ashby Canal and calls in to meet a mate who lives on an historic narrowboat. Along the way he's forced to carry out a running repair, when the Naughty Lass breaks down in rural Leicestershire.

A window gets smashed onboard the Naughty Lass and Robbie receives a soaking inside the watery Blisworth Tunnel as he continues his journey down the Grand Union Canal. Along the way he crosses several impressive aqueducts.