The Monster Freed (The Fenris Series)

Fenris lies in chains, imprisoned on a desolate island by Óðinn the All-father. Betrayed, alone, and pregnant, his wife Sol is forced to rely on the man whom legends have taught her to fear: Fenris's father, Loki the Lie-smith. Together, Sol and Loki develop a plan to rescue Fenris from his prison in lake Amsvartnir.Doing so might kill them all.And success will force Fenris to surrender the very thing that kept him alive.