The war between good and evil has raged for millennia, but now evil is winning, and The Marked Souls are caught in the middle...

Liam Niall never wanted to be a leader, but after surviving the horrors of the Irish potato famine he found himself possessed by a demon in search of redemption. Now, he heads the Chicago talyan in their fight against evil, though he grows weary and plagued by self-doubt.

Then he meets Jilly Chan. She's a mentor to local homeless youth—and waging a one-woman war against the drug-dealing slime that preys upon her charges. She's already half-taken by a demon, so Liam reluctantly tries to guide her into full power.

Even as the proudly independent Jilly struggles to remain true to her own soul, Liam's fiercely passionate touch soon leaves a mark of desire on her flesh as enduring as her new demon tattoo.