Reign of Darkness - Rogues of Magic Series, #7

They took her throne. They stripped her of her freedom. Now she's taking them back. Framed for the brutal murders of her father and stepmother, Ann is desperate to clear her name and reclaim what's rightfully hers. With her husband and her fellow rogues in tow, she races to rebuild her shattered life, but her hopes are dashed when a plague sweeps through the five lands of Almara, leaving chaos in its wake.
Now it's a race against time to find the source behind the unprecedented attack and ultimately take her rightful place as the Archdruid. But the journey will not be easy. Her foes are many and one is mightier than the others combined. Will she defeat the elders once and for all, or has her fate already been sealed?