Tess Noncoire may be a warrior of the Celestial Blade, but she can't fight demons without Scrap, her imp familiar who becomes the Celestial Blade. Scrap has gone walkabout. Before he leaves he bequeaths to Tess the onyx fountain pen she used to sign in blood a special document for the Powers That Be. Scrap knows that Tess is going to need this special pen while he's away. Figuring out how and when to use it is only half the battle with a pukha who portends death.