But Lyra caught the key point!
"You said you saw big brother yesterday? Where is big brother now?" she asked.
"Hmph," Gregory snorted, "I'm not telling you."
If Lyra couldn't ask Gregory about her big brother, she'd ask about Frank, so she continued, "What about Frank then? Where is he now?"
"Hmph," Lyra snorted again, "Still not telling you."
Lyra: "..." Frustrated!!!
Frank had joined Doctors Without Borders, which Lyra learned from the hospital he used to work at. Doctors Without Borders meant that there was no stable place to land; today he might be in the Eastern country, tomorrow in Wiley Country.
If during the phone call, Gregory hadn't said that he was with Frank, Lyra wouldn't have asked further questions.
Because asking would be pointless.
But now!
Gregory was with Frank, which meant there was a definite address.