Like “Twilight,” vampires and werewolves populate The Mortal Instruments’s fantasy world, but the trilogy - which wraps up with the March 24 release of “City of Glass” - is chiefly concerned with more heavenly matters: the nephilim, humans with angel blood in their veins. The series follows 15-year-old Brooklyn girl Clary Fray’s whirlwind introduction to the world of Shadowhunters, nephilim warriors who protect oblivious humans from dangers presented by vamps, werewolves and other kinds of baddies. If you thought that human Bella and vampire Edward’s relationship was fraught with issues, imagine how much more traumatic it is for Clary to find out that the guy she’s in love with might just be . . . . —The New York Post, February 7, 2009