 
    The second volume in the author's alternative history trilogy, following Newton's Cannon, pits Sir Isaac Newton and Benjamin Franklin against a wave of black magic that plays havoc with the history of the eighteenth-century Europe. Original.
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non, the critically acclaimed first volume in J. Gregory Keyes's Age of Unreason series, brilliantly combined the best of alternate history, fantasy, and science fiction in a bravura reimagining of the tempestuous eighteenth century. Now, Keyes triumphantly adds to his masterpiece in the making . . .
A CALCULUS OF ANGELS
1722: A second Dark Age looms after the devastating impact of an asteroid, unnaturally drawn to Earth by dire creatures who plot against the world of men. Yet this destruction is just the opening salvo in a war of annihilation.
Sir Isaac Newton and his young apprentice, Benjamin Franklin, have taken refuge in ancient Prague, seeking the secrets of the aetheric beings whose vast powers and new sciences have so nearly destroyed humanity . . . yet who may prove to be its last, great hope.
But their safety is tenuous, as Peter the Great marches his unstoppable forces across Europe. And half a world away, Cotton Mather and Blackbeard the
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