Kidnapped in New Orleans, Jessie is forced aboard a slave ship bound for Africa, where he is required both to act as a ship's boy and, when the slaves are brought on board, to play his fife while they are "danced" -- that is, forced to exercise. On the ship he meets the vicious and greedy captain, and the sullen and contentious crew.
But the rigors of the trip west across the Atlantic, including the brutal and unjust flogging of one of the sailors, do not prepare him for the horrors of the return trip, as the slaves are packed into the hold on top of each other, brutalized, malnourished, thrown overboard when they die, and forced to dance to the sound of Jessie's fife.