** MAJOR SPOILER ALERT**
** LOOK AWAY NOW IF YOU DON'T WANNA KNOW **
** GIVING YOU ONE LAST CHANCE **
** SCROLL BELOW AT YOUR OWN RISK **
The US/Target version of the book has a different comic strip scene at the back. The artwork is by the amazing Cassandra Jean and it shows Magnus opening a portal in Idris for Emma Carstairs and the Blackthorn children to go back home to the Los Angeles Institute. There is a tender moment between Emma and Jace (very cute) and also between Clace :) Enjoy! (Click to enlarge).
Source: Thank you to The-Light-Of-A-Star for posting it on their tumblr.