Annabeth solved the problem. She dug around in her backpack, brought out Daedalus’s laptop, and typed in a few commands. A plastic card ejected from a slot in the side.
Annabeth waved it triumphantly. “International credit card. For emergencies.”
Percy stared at her in amazement. “How did you—? No. Never mind. I don’t want to know. Just keep being awesome.”

The Mark of Athena, Chapter XXXII