It's Halloween. Clary and Jace are on holiday in England. The Weasleys are also on holiday, visiting Hermione's muggle relatives in York. Rose and Hugo go trick-or-treating, but when they knock at the door of a old converted church, everyone gets a surprise.

The Mortal War may be over, but Clary and Jace still have enemies – and those enemies want to see them separated forever. Adventure, a quest, and some silly Clace fluffiness.

Set shortly after the end of CoHF; the gang are back in New York, and Clary now has her own room at the Institute. Unsurprisingly, it doesn't get that much use, and Clary's mom decides that she and her daughter need to have a Serious Talk. Clary and Jace are less keen on this idea. A bit of silly Clace fluff.

Thirty something years after the end of CoHF, our heroes are – more or less – living happily ever after. Needing to supplement their incomes from the Clave, Clary and Isabelle have developed a slightly unexpected additional career. Will everything go smoothly . . . ? Of course not, these are Shadowhunters!