Firstborn by Brandon Sanderson

The story follows Dennison Crestmar, a young man overshadowed by his older brother Varion, a celebrated military genius. Despite his lack of talent in strategy and combat, Dennison is thrust into a high-stakes conflict when Varion unexpectedly betrays their nation. As Dennison navigates the complexities of loyalty and duty, he must confront his own insecurities and rise to the challenge of stopping his brother, ultimately discovering his own strengths and potential in the process. The narrative explores themes of family, identity, and the burden of expectations.