A mind-boggling new sequel to Infernal Devices to celebrate thirty years of Steampunk.Some time after the events of Fiendish Schemes, George Dower finds himself a widower, of sorts. On her deathbed, Miss McThane entrusts Dower with a small, ticking clockwork box. The box is mysteriously linked to her.When she breathes her last, the box stops ticking and Dower is able to open it, to find hundreds of letters – written in an unknown hand, signed only with the initial S. They’re not love letters, but refer instead to the letter-writer’s ongoing search for some other person. The last is a simple note, reading “Found him”…