Watchmaker of Filigree Street series

In 1883, Thaniel Steepleton returns to his tiny flat to find a gold pocketwatch on his pillow. But he has worse fears than generous burglars; he is a telegraphist at the Home Office, which has just received a threat for what could be the largest-scale Fenian bombing in history. When the watch saves Thaniel's life in a blast that destroys Scotland Yard, he goes in search of its maker, Keita Mori--a kind, lonely immigrant who sweeps him into a new world...