"In my shadow," Childermass answers rather mysteriously, though since this is Childermass, he won't let that linger. "Literally. It may not be the best option if you're afraid of the dark, but it's not harmful save for the lack of light."

Because literally, a shadow. The problem is, he has no idea how long he can keep someone stuck in a shadow or if he'd be able to hide more than one in any one shadow at a time if they did manage to find the girl's friends. Well, time will tell.

Besides that, Baker is sniffing at the necklace and the magician refocuses on him instead.

"Well? We're looking for a man, not the girl."