Ghosts of the Shadow Market by Cassandra Clare, Sarah Rees Brennan, Maureen Johnson, Kelly Link and Robin Wasserman

The Shadow Market is a place for Downworlders to meet, socialize, and purchase magical items.  Shadowhunters are not usually welcome there.  However, Brother Zachariah is on a mission to search for a missing Shadowhunter and haunts the Shadow Market for information family.

This is a collection of short stories set in the world of Cassandra Clare's Shadowhunters series.  The tying theme between the stories is Brother Zachariah and the Shadow Market.  This is a definite must-read for those who enjoyed the Shadowhunters series as it fills in the back story and history of several characters and events.