C. L. Clark’s 2023 The Faithless is the second volume in the on-going Magic of the Lost secondary-world fantasy trilogy1.
In the first volume: the city of Qazāl and the regions around Qazāl have been liberated from the imperialist Balladairans. Also, Princess Luca hopes to succeed to the throne of Balladaire, replacing her unpleasant uncle.
Surely every significant problem has been solved, leaving characters to focus on ill-advised love affairs. Then stuff happens.