Young Bleys by Gordon R. Dickson
Sequel to The Final Encyclopedia and newest in Dickson's masterpiece, The Childe Cycle. Disciplined by Friendlies, schooled by Exotics, Dahno builds an interplanetary network of half-breeds called "Others". But Dahno only wants wealth and power for himself, whereas his half-brother, Bleys, sees an opportunity to challenge the Dorsai for control of the Human Worlds.