Warlord: Wolfblade trilogy Book Three by Jennifer Fallon
Marla Wolfblade is reeling from the loss of her closest advisor, who taught her how to rule a kingdom and to take control of Hythria. But Marla's plans for revenge are disrupted when she discovers a dangerous adversary.
And on their borders, a neighbouring kingdom has massed its troops for invasion. Damin Wolfblade, Marla's eldest son, finds his ability to fight back is thwarted by tradition, politics and the dangerous foolishness of the High Prince.
Back in the city of Krakendar, Damin's uncle Mahkas awaits news of the battle and has sealed the gates against his nephew's return. With the population on the brink of starvation, it seems only theft on an unprecedented scale can free Krakandar from Mahkas's madness and tyranny ... and destroy Hythria's web of secrets and lies.