 With "A King's Trade", Lewrie is in deep trouble once more as the conversion of some black slaves to Royal Navy seamen comes back to haunt him.Legal action beckons, forcing Lewrie into the arms of William Wilberforce and the Abolitionist movement.In the meantime, Lewrie must escort a trade convoy to South Africa, developing a—so far—chaste relationship with a young Russian woman and a ferocious encounter with a marauding French frigate.