Jace and Clary are married and have a child on the way, but Jace's younger sister, Ellie, is different. She keeps seeing things in her dreams and they keep coming true. First it starts off as small things, like knowing what people are going to say or what they'll where, but then it becomes more. She knows when Jace is going to propose and when Clary gets pregnant. But then they become something more, and they keep coming true.

Set two years after CoHF. Jace and Clary are married and living in Idris, when Clary becomes pregnant. All she wants is a baby, but all Jace wants is Clary. Is there room in the Herondale family for three? Or will it tear them apart? CONTAINS SPOILERS FROM CLOCKWORK PRINCESS! DON'T READ UNLESS YOU'VE READ ALL THE TMI AND TID BOOKS!