Return of the Guardian-King. Legends of the Guardian-King, #4

Believed dead by all but the handful of supporters who rescued him from his Mataian enemies, Abramm Kalladorne has fled his homeland to the high mountains of northern Chesedh. Traveling under a new name with a group of bitter and increasingly desperate fellow exiles, Abramm hopes to reunite with his wife, Maddie, where he will offer his services to her father in fighting the invading armies of the Black Moon.
But with every step, he is thwarted from the direction he wants to take, and it soon becomes clear Eidon has other plans for him. In the royal city of Fannath Rill, Maddie alone believes Abramm still lives. But since she has no proof, her friends, family, and public opinion press her to remarry. With its neighboring realms now under enemy control, Chesedh has become the last bastion of Eidon's Light.
Desperately overmatched, it cannot survive on its own. Yet an eastern warlord has a vast fleet of galley ships that could turn the tide in their favor if Maddie agrees to his offer. As war, betrayal, and shifting alliances close in, both Maddie and Abramm have their faith tested beyond what either of them could ever imagine. Set in a world of swords and cloaks, of glittering palaces and mystical temples, of galley ships and ancient mist-bound cities, The Return of the Guardian-King is the final volume of an epic series, Legends of the Guardian-King.