As Meghan settles into life in the Seattle Underground, disabling attacks begin to plague her. Meghan had imagined she would spend her time underground reconnecting with Avery. Instead, she fights to remain conscious. After her illness threatens to reveal the Fae's secrets, Avery and Meghan return to England to seek out a cure. Unknowingly suffering from the same affliction, Kiernan struggles to balance his desire for Meghan with his responsibility as leader of the Fae. When he learns of Meghan's illness, Kiernan realizes their blood connection may hold dire consequences for his people. Kiernan may need to sacrifice himself to save everyone he loves.