In an alternate modern world where men are near extinction, magic shapes society. Young men attend Eden College, where girls hope to awaken their powers through a Mana Knight bond. Kaylee Ryder discovers that being near Ronin Sawyer strengthens her and other girls, while they investigate why men die before forty. Ronin is an adrenaline-seeking loner who wants to join the military, but secretly he is a science experiment created by his adopted grandfather: a biotic soldier powered by dark matter energy and psionic abilities that unlock the human brain’s potential. After his grandfather is killed, Ronin’s goal is to find and kill the woman responsible.