From the New York Times bestselling author of Incarceron comes a masterfully interwoven, spine-tingling historical thriller. Three lives. One circle. And a mystery that echoes through time. TODAY: Sulis, a teenage girl with a mysterious past, arrives in Bath, England, with a new identity. She feels safe at the King’s Circus, a ring of old, strange stone houses where she lives with her foster family—until she spots the one person she’s been trying to outrun. THREE HUNDRED YEARS AGO: Zac is apprenticed to a mad architect who plans to create the world’s first circular street, the King’s Circus. Zac probes the mysticism surrounding the structure, but he has his own secret agenda. THE ANCIENT PAST: The mythical first builder of the city of Bath, a leprous druid king, discovers its healing waters . . . but to what end? In each voice, unexpected mysteries entwine, linking together three haunting stories as they hurtle toward a smart and brilliantly intriguing climax—a mystery-thriller not to be missed.