All Jorinde wants is to make a success of the business her father left to her.

Then the weatherworker hired to fill the sails of her barge as it travels upriver is found dead.

Almost everyone on the barge, passengers and crew, seems to have had a reason to be angry with the dead man. Can Jorinde discover which of them is a murderer, prevent them from killing again to hide their crime and get everyone else safely to their final port on time?