Ducem Barr is the sixth son of Onum Barr. He enlisted in the fleet as a gunner under an assumed name in order to avoid being killed. Later, he takes revenge by killing the man responsible for the harm to his family. Forty years after this, he becomes an unwilling adviser to Bel Riose who blackmails him with the secret knowledge of Ducem's revenge. He forms a partnership with the Trader Lathan Devers, and they escape Riose in an attempt to frame him as a traitor.