In Karen Marie Moning’s Fever series installment 'Feverborn', familiar characters like Mac, Barrons, Ryodan, and Jada return to face unprecedented challenges. The destruction of the ancient wall that separated the worlds of Man and Faery has damaged the universe, causing Earth to vanish gradually. The only hope is the legendary Song of Making, a powerful life-sustaining melody. As various factions vie for this solution, including the warring Keltar and dominant immortals in Dublin, internal and external conflicts intensify. Mac confronts her deadliest enemy, herself, in the now dangerously magical city of Dublin.