When Jax gets summoned by his best friend and asked to protect his only child, Cassie, who's been hidden away in the human world, he agrees. He thought it would be simple - protect the girl while she learns the truth about herself and the abilities she holds. What he hasn't counted on is the shock that runs through him when they touch, immersing him in feelings and memories he can't place. As he tries to figure out the nature of the bond that connects them, he realises that something else is at play - a magic that could be working for or against them. Will he be able to honour his promise and keep Cassie safe?