“...right.” The boy is obviously lying (to himself, if not to her), but she doesn’t push it. There are more important things to worry about and picking a fight with a random teenager isn’t going to help her get back to London any faster.

She decides to play dumb.

“My name is Peggy, and it’s very important that I get back to King’s Cross. Can you help me find it?” Doubtful, because the boy sounds American, but asking could prove useful.