Shadow Hand by Anne Elisabeth Stengl

Description: By her father’s wish, Lady Daylily is betrothed to the Prince of Southlands. Not the prince she loves, handsome and dispossessed Lionheart, but his cousin, the awkward and foolish Prince Foxbrush. As her wedding day dawns, Daylily flees into the dangerous Wilderlands, her only desire to vanish from living memory.

But Foxbrush, determined to rescue his betrothed, pursues Daylily into a new world of magic and peril, a world where vicious Faerie beasts hold sway, a world invaded by a lethal parasite. 

A world that is hauntingly familiar.