Book Four: Chapter 51

“Tink see, too!” She had shoved her face against the door, turning her face sideways to see behind the mechanism of the door. “Tumblers move rods, unlock door.”

“So, what, do we just have to get the combination right?” Mike grabbed the lever and gave it a pull. The door emitted a series of clicks, but failed to open when he pulled the handle.

“It would seem that way.” Dana knocked on the door a few times and put her ear against it. “Can you turn one of the gears for me?”

“Yeah, sure.” Mike grabbed the one closest to him and gave it a slow turn. The thick teeth of the gear clicked as a series of symbols moved through circular openings in the middle of the door. There were seven windows, and the symbols were changing in only two of them. He watched the symbols cycle through, and he looked at Dana, waiting for further instructions. They had yet to repeat, and he noticed that one of the symbols changed three times faster than the other.

“Oh, wow.” Dana said, then