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Jessica Plunkenstein and the Dusseldorf Conspiracy Hints
A gallon of liquid petroleum
1 of 13: There's a gas pump on the helipad.
2 of 13: But it requires an activation card.
3 of 13: Have you met anyone who might have one?
4 of 13: Anyone who drives a gas-powered vehicle?
5 of 13: Talk to the helicopter pilot.
6 of 13: Ask where he's going twice and then if you can pump gas for him. He'll give you his gas card.
7 of 13: But the card needs a seal.
8 of 13: Have you seen anything else with a seal?
9 of 13: A book, maybe?
10 of 13: Have you looked at "Herbert J. Parthenogensis: Treatise on the Amazonian Mulberry Bush, Second Edition"?