Set after the events of City of Heavenly Fire, Magnus is now able to settle into his relationship with Alec. Likewise Tessa is now reunited with a mortal, healthy Jem. You would think that everyone is living happily ever after. And they were. That was until some people from the past came back, much to Magnus' and Tessa's horror. It looks like Magnus will have to save the day. But at what price?