Charlie Thorne and the Last Equation

Her cleverness kept me hooked, but I wondered if her confidence ever made her underestimate the danger. How did others feel about her approach?

It added a unique twist to the classic treasure hunt. I'm curious if the author was inspired by real historical puzzles or just loved the idea of code-breaking.

The action picked up again later, but I wondered if that was intentional to build suspense or just me losing momentum.