A policewoman takes Amy and Dan back home, where they tell Nellie, their au pair, that they have to go on a family scavenger hunt.
They entice Nellie into driving them by mentioning her three favorite things: "guys, food, and money" (6.42).
To make money for the trip, Amy plans on selling all of Grace's jewelry except for the jade dragon necklace.
When Dan packs for the trip, he brings along the only photo of his parents that he has.
Then he tells Amy that he's planning on selling his entire collection of baseball cards and collectibles to boost their travel fund.
Once they're all packed, Amy says they need to buy three train tickets. They're going to Philadelphia, land of cream cheese, Philadelphia freedom, and maybe the second of 39 clues. But mostly cream cheese.