1883. Thaniel Steepleton returns to his tiny London apartment to find a gold pocket watch on his pillow. Six months later, the mysterious timepiece draws him away from a blast that destroys Scotland Yard. At last, he goes in search of its maker. Keita Mori is a kind, lonely immigrant from Japan. He seems harmless, yet a chain of unexplainable events suggests he is hiding something. Enter Oxford physicist Grace Carrow, and Thaniel is torn between loyalties.