This book continues Michael Flynn's unique Celtic-flavoured SF saga. It's an immediate sequel to Up Jim River, the previous book in the series, and continues with much the same feel.
Just as the Harper Mearana recovered her mother, Bridget Ban, in the last novel, her father Donovan has gone missing. The novel is a retelling of what happened to him, and how his story ties in with the larger scheme of things. A clandestine civil war is brewing in the Confederacy of Core Worlds (the "bad guys"), as their elite intelligence service consider whether or not to go up against Those of Name, the CCW's ruling caste.
Donovan, the protagonist, is an amazingly well-crafted character, as are most of the other key players in this story. There is also a gripping plot in which we get to see some of the CCW, which we haven't seen in any of the previous novels. It all builds up to a thoroughly satisfying conclusion, while still setting the stage for the next novel, the final installment of the series. I can hardly wait.