Lost Mesa is featured in book three as the place of importance for both the Knights of the Dawn, and the Society of the Evening Star since it was one of the secret preserves. The mission to recover the artifact that was hidden there, the Chronometer, ended up being pointless, as the artifact had been moved many decades before by Patton Burgess to Fablehaven. In the end of the book, it is revealed that Lost Mesa had fallen shortly after Kendra and Warren's visit there.