I tore across the Mall, not daring to look behind me. I burst into the Air and Space Museum and took off my invisibility cap once I was through the admissions area.

The main part of the museum was one huge room with rockets and airplanes hanging from the ceiling. Three levels of balconies curled around, so you could look at the exhibits from all different heights. The place wasn't crowded, just a few families and a couple of tour groups of kids, probably doing one of those holiday school trips. I wanted to yell at them all to leave, but I figured that would only get me arrested. I had to find Thalia and Grover and the Hunters. Any minute, the skeleton dudes were going to invade the museum, and I didn't think they would settle for an audio tour.

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