The Order of Brigid's Cross Books in Order

The Order of Brigid's Cross takes one branch of the O'Reilly family and moves it into darker, more myth-heavy territory. The central figure is Sean O'Reilly, a Chicago detective who is already carrying more than most people know. As a boy in Ireland, he saw something in a forest that changed his life. Years later, when he is asked to interview a child witness after a massacre tied to gang violence, the boy's story sounds impossible to everyone else. To Sean, it sounds familiar.

That is where the series starts to open.

These books are part police story, part urban fantasy, and part Irish supernatural tale. Sean's work brings him into contact with creatures and forces that sit just outside ordinary human sight, and Reid uses that overlap well. The living are dangerous enough. Add in old fae grudges, hidden orders, spiritual warfare, and things that have crossed into the human world, and the stakes rise fast.

Sean makes a strong lead because he is not entering this world as a wide-eyed beginner. He has history with it, and that history is painful. He believes because he has already been marked by what he saw. That gives the books a more serious tone than some of Reid's cozier work. The danger feels older. The consequences feel heavier. And the series is willing to follow its mythology into darker corners.

Still, Reid keeps the story anchored through character and family. Sean is part of the larger O'Reilly network, and that connection matters. The books are not just about monsters and magic. They are about what it costs to be the person who sees the threat, believes the witness, and cannot look away.

If you like urban fantasy with a detective spine, Irish supernatural roots, and a hero who has one foot in the ordinary world and one in something much stranger, this series is worth your time. Start with The Order of Brigid's Cross, continue with The Faery Portal, and move into The Faery Court. The mythology builds, and Sean's place inside it becomes clearer the farther you go.