The below summary contains spoilers. Austin and Adia's love was formed around a ticking time bomb. First it was Adia waiting for Shemu to claim her soul after saving Austin. Then it was their numbered days in the City of Souls. Followed by their time in Castle. Now it's the ultimate time bomb before the shadows claim Adia as their own. Adia believes she finally has her happy ending with Austin, unaware the shadows torment her into hurting him every night. While the hunters tackle the dark souls plaguing Earth, Adia and Austin's relationship is tested. She is the key in destroying the shadows but as her reality twists, her allegiance is the price she will have to pay to keep her people safe. As they approach the end, Cora's visions are unreliable. Frustrations rise amongst the team of hunters as desperation takes hold. Cora and Lamarse’s past is told and all secrets are revealed. Shadows is the final installment in the Shadow World trilogy.