First series in the Shadowhunters world by Cassandra Clare.
The Shadowhunters—touched by angels and charged with protecting innocents—battle demons and other evil in the bestselling The Mortal Instruments series.
Prequel: Clockwork Angel
Book one: City of Bones
Book two: City of Ashes
Book three: City of Glass
Book four: City of Fallen Angels
Book five: City of Lost Souls
Book six: City of Heavenly Fire
Companion novella: Son of the Dawn
Companion novella: Cast Long Shadows