For the "peripety," or sudden reversal of circumstances, on which the plot of the "Hellenica" hinges, see Grote, "H. G." x.
"Hellenica"
Xenophon
When Mr. Archer brings in the relief party of aviators just at the crucial moment, as hero and heroine are about to be slain, he has peripety in mind.
"Seeing Things at Night"
Heywood Broun