Black Fire by Sonni Cooper
When sabotage strikes the Enterprise, Spock’s investigation leads him into an alliance with the Romulan and Klingon empires against the Tomarii, a bloodthirsty race for whom war is life itself. Spock is declared a traitor and sentenced to the Federation’s highest-security prison, and Kirk must choose between friendship and duty, with dire consequences for himself, Spock, and the entire Federation if he’s wrong.
When sabotage strikes the Enterprise, Spock’s investigation leads him into an alliance with the Romulan and Klingon empires against the Tomarii, a bloodthirsty race for whom war is life itself. Spock is declared a traitor and sentenced to the Federation’s highest-security prison, and Kirk must choose between friendship and duty, with dire consequences for himself, Spock, and the entire Federation if he’s wrong.