"She who wields the mark is the barrier between man and monster. She is the daughter of gods, the mother of man, protector of all. Vigilati Usque Ad Mortem" All Isla Macallen wanted was a simple existence on her little Scottish island, free from her mother's insanity and the prying eyes of neighbors. What she got was embroiled in a war for the souls of mankind. A war of good versus evil, of witches versus demons, and Isla learns that she alone can end it. Dr. Jeremiah Rousseau was a self-proclaimed nomad, traveling the world researching paranormal phenomena. He doesn't expect his research to lead him to Scotland, and to the woman who will turn his world upside down. Together with a facetious shapeshifting animal spirit guide, Jeremiah and Isla discover that she is part of an ancient bloodline bred to protect the gateways between the human world and the spirit world, to keep evil demons from destroying them. They must find the key to defeating Alastore, the demon king, and closing the gate before Samhain, when the veil between the worlds is lifted. As the war for their souls wages around them, Isla and Jeremiah will risk it all for love-a love neither had ever thought possible.

Can a traumatized veteran-turned-mercenary who is tormented by voices in his head be saved by the love of a wayward single mother with demons of her own? Afflicted by PTSD from serving in Afghanistan, and tormented by a childhood trauma, transient veteran Matthieu Rousseau struggles with the choices he's made in his life. Estranged from his family, Matthieu drifts from one mercenary job to the next, until one thing stops him. Fate. In hiding from her abusive ex-husband, musician Fate Callahan lives in New Orleans with her seven-year-old daughter. She remains in constant fear of being found, and her worst nightmare comes alive when a dark, dangerous stranger tells her he's been hired to locate and kill her-but wants to save her instead. Fate and Matthieu find themselves on the run together, fleeing from the hitmen and an unseen evil worse than anything else they'll face. While just trying to stay alive, they become entangled in the battle between the Vigilati and the Lochrim; an archaic sect of witches and the evil creatures they are bred to fight. Unbeknownst to Fate and Matthieu, they are more deeply connected to the Vigilati than either of them could ever imagine. They must join family and allies of the Vigilati to help save the human world, possibly saving each other along the way. Matthieu teaches Fate how to trust in love again, while she gives him back the one thing he never thought he deserved-family.

The daughter of a Las Vegas hustler, Raven Sabatier grew up trusting nothing and no one-she doesn't even trust herself to stay in one place for longer than a minute. When her quest to find out the secrets of her past leads her to the mountains of North Carolina, she's set on a collision course with the one man she thought she'd never see again. In Appalachia consulting on an archeological dig, Anthropologist Dr. Drew Deveraux comes face to face with the indomitable beauty who broke into his apartment a year ago, tilting his carefully cultivated world on its axis. Engaged in a fight with their demons, both imagined and real, the last thing either of them expected to find was love. Together, they must unravel the mystery of Raven's past and her connection with an ancient race of witches, in order to save their future-and all of the souls hanging in the balance.