Detective Isaac Bell tracks a killer across the nation's oilfields in this adventure in the #1 New York Times-bestselling historical series. As Van Dorn private detective Isaac Bell strives to land a government contract to investigate John D. Rockefeller's Standard Oil monopoly, the case takes a deadly turn. A sniper begins murdering opponents of Standard Oil, and soon the assassin-shooting with extraordinary accuracy at seemingly impossible long range-kills Bell's best witness. Then the shooter detonates a terrible explosion that sets the victim's independent refinery ablaze. Bell summons his best detectives to hunt down the mysterious killer. But the murders-shootings, poisonings, staged accidents-have just begun as Bell tracks his phantom-like criminal adversary from the "oil fever" regions of Kansas and Texas to Washington, D.C., to the tycoons' enclave of New York, to Russia's war-torn Baku oil fields on the Caspian Sea, and back to America for a final, desperate confrontation. And this one will be the most explosive of all.