A ghoul is at large. A Guardian is dead. Trouble has come to Lumen.
Aided by the shadowy figure known as the Master, the ghoul has eluded Trey Shield and the Bureau for months. As it consumes the souls of magicians, it grows more powerful. And now it hungers for the Guardian's successor, a young woman suddenly charged with bearing a centuries-old magical artifact: the debutante Arabella Trent.
Trey never wanted to involve Arabella in danger, but it's come for her anyway. The two must join forces to defeat the Master's sinister plot and save their city.