Boston Preternatural Investigations Unit

Boston Homicide Detective Caitlin Reagan walks a razor's edge, propping up her life on emotional constructs designed to help her manage grueling PTSD. She keeps her mother, boyfriend, and work separated and controlled, all in service to one horrible, tragic act she committed amid the Iraq war.

Detective Cait Reagan, forever changed by her relationship with Marcella Carson, has survived the opening of the Black Gate and the vampire curse. Now, seemingly cured, Cait has a new lease on her mortal life, but difficulties beset her at every turn. Cait’s mother, Róisín, is neurologically devastated, unable to function without constant supervision, and her reunion with Morgan Kennedy, the first woman she ever loved, is downright awkward. In the meantime, Cait struggles to raise Katie, the sixteen-year-old vampire she turned in a desperate bid to save her life.

Two thousand years before Cait Reagan was a twinkle in The Morrigan’s eye, Weyna played handmaid to that very same Goddess in the year leading up to the Second Battle of Maighe Tuireadh, where the Tuatha de Dannan faced the forces of Fomori in a climactic final battle. But when Weyna stuns the assembled Gods and Goddesses by taking down the greatest fighter the Óșeni have ever known using a technique she never learned, she sets in motion a series of events that will ultimately lead to the discovery a long-buried secret two millennia later.

In a world where light deceives and darkness speaks in whispers, Cait Reagan’s quest to save her sister will awaken powers—and enemies—beyond her wildest nightmares. Bound for Ireland, Cait’s mission to rescue her sister, Aoife, falters before it even begins. The journey ahead is perilous, and Cait’s complicated feelings for Elizabeth and Nastasia only deepen the stakes. But even worse, the Light Fae—once the guardians of all that is good—have transformed into something far darker. The Emerald Isle, meant to be a sanctuary, feels more like a snare closing in.