From the International Bestselling Author of the Scanguards Series:

Able to render themselves invisible, immortal Cloak Warriors like Aiden have been protecting humans from the dark power of the Demons of Fear for centuries. But the demons might soon have a powerful tool in their hands to seduce humans to the dark side. And the person to provide them with this elixir is the human scientist Leila. Unbeknownst to her, the drug she’s developing to cure Alzheimer’s Disease has the unexpected side effect of weakening the mind’s resistance to the influence of demons.

The Council of Cloak Warriors is divided, some of them believing the only safe way to eradicate this threat is to eliminate its inventor; others are bent on protecting the human scientist. Aiden is a loyal Cloak Warrior who accepts the assignment to protect her, despite his own beliefs that humans can’t be trusted. However, when her life is endangered, his beliefs shift, and he’s drawn into a battle whose participants are unknown: is he fighting the demons or his fellow Cloak Warriors?

Forbidden desire flares between Aiden and Leila as they are forced to rely on the only people they can trust: each other. And even if he can save her and defeat their enemies, a union between them might be the most dangerous undertaking of all.