Cathryn Whitmore, the driven and hard-working woman at the helm of Carruthers Initiative Institute, has always been unlucky in love. She tells herself that there's no room in her life for a serious relationship, and that's partly true; together with her friends and the agents who work for her, she's on a mission to stop a pervasive evil from setting off an apocalypse that will spell the end of the world.

But that was before she took a trip to Ireland to recruit three gifted brothers to fight by her side.

When Seamus O'Casey first lays eyes on Cathryn, he knows that he's lost his heart. But convincing her of this truth won't be easy. It'll take all of his charm—not to mention his supernatural abilities—to win her trust . . . and her love.