Even more confounding were the notebooks. She’d examined the one that was on top of the pile, expecting to find some sort of diary or a manifesto. Instead, it had been crude drawings of geometric figures, with every part neatly labeled in some kind of two-part code. Hiding a chemical reaction was one thing, but coding the formula for the circumference of a circle was so illogical she couldn’t even begin to fathom what kind of a person had occupied the tent.