The Madness Series/Fluctuation

Madness: Fluctuation is the third installment in the Madness Series. This book begins the "golden age" within the series and describes a time of tranquil (sometimes, not-so-tranquil...) peace.

fluc·tu·a·tion, /fləkCHo͞oˈāSHən/

Noun - an irregular rising and falling in number or amount; a variation.