When Colin discovers his son is on a murder charge in France, he trails his small boat, The Dragonfly, across the channel to Paris to try and help him. There he meets his grand-daughter - the irrepressible Delphine - for the first time. They embark on an exciting boat journey through the picturesque French canals, heading south through Burgundy, 'until the butter melts'. Along the way, they catch up with Tyler, a spirited American, and through various mishaps and mis-understandings, they land big fish, cultivate new loves and uncover a burning secret. But can Colin finally help his son get off the hook?