Marquess Idris Thane can see the dead. It's a family curse he's managed to hide for thirty years by being a shut-in nobody questions. Then his dead father appears — not drifting aimlessly like other spirits, but *lucid*, furious, and pointing at a name Idris doesn't recognize. The name belongs to Elske, a glassblower in the trade district who has her own secret: she can trap ghosts in glass. She's been doing it for years, quietly capturing dangerous spirits for clients who pay well and ask nothing. When Idris shows up at her shop, she assumes he's another customer. He assumes she's a charlatan. Then his father's ghost shatters every piece of glass in her workshop, and they both realize they're dealing with the same problem from opposite ends — someone has been *manufacturing* ghosts. Killing people and binding their spirits for a purpose neither of them understands yet. He sees them. She catches them. Neither can solve this alone. He offers his name and estate as cover for her illegal trade; she offers to trap the thing that's been following his family for generations. The arrangement is professional. The fact that she's the first person he's ever met who doesn't think he's insane is not.