Fitz is the illegitimate son of Prince Chevalerie, heir to the kingdom of the Six Duchys. Driven to the fortress of the Farsighting while he is still only a child, he is entrusted to the master of the stables like a bastard of little importance. Until King Subtil notices him and decides to make him his personal assassin. Then begins for Fitz a long initiation sown with pitfalls, object despite him of manipulations which he tries, despite his young age, to understand the stakes.