For math prodigy Leonhard Euler, the Bernoulli family have been more than just friends. Master Johann has been a demanding mentor, and his sons have been Leonhard's allies and companions. But this is a family torn by jealousy. Father and sons are engaged in a ruthless competition for prestige among the mathematical elites of Europe. And now, their aspirations may have turned deadly. Lured into an investigation of the suspicious death of Jacob Bernoulli, his master's brother, twenty years ago, Leonhard soon discovers he's facing an elusive puzzle as complicated as any math equation.