Sequel to Zero Sum Game, which saw mathematical (anti) heroine Cas Russell claim victory, but possibly at the cost of her own sanity. She spends most of this book dealing with the fallout from that and (over)reacting in ways that make both friends and enemies nervous. Her motives are pure but her tactics are extremely questionable, and she gradually works herself into a corner from which not even she can plot a possible escape vector. Loved how the title was used in the plot; definitely wondering what will come next.