She smirks at his little ploy. "Every business has a ledger. Where it's kept and what it's made of depends on the type of business - and the debts."

Amelia was certainly careful with how she kept track of her less legal activities that led to debts on her world. She had to, if she wasn't going to take money for her services, but instead take payment in the form of favors to be paid back at a future time. One false step can take down the best laid plans and she wasn't going to let that happen, no matter the personal cost.

"I certainly didn't keep any ledgers that looked like this," she teases, motioning to his stack of books on Earth, "and I'm certain these aren't ledgers either." She reaches out a hand to trace the air in front of the spines before looking at Felix curiously. "Why the fascination with Earth today?"