This is a spoiler for lady midnight! Do not read if you haven't read the book yet!
Spoilers are coming
I know who the lost herondale is!! Its johnny rooks son, kit, which is short for Christopher. Christopher jonathon herondale, that's his full name. Maybe that's where have got his middle name! Well, I'm really excited that I finally found out!!! I'm confused how kit is going to be worse than Stephen since he was basically raised as a mudane, no training or anything. He has blonde hair and blue eyes. WarriorCats3636 its the little kid from the park! He was the lost herondale!!!
I just made a REALLY big discovery!