But the design is not yet complete. And when Colonel Nagorski, the weapon's secretive and eccentric architect, is found murdered, Stalin sends for Pekkala, his most trusted investigator. Stalin is convinced that a sinister group calling itself the White Guild, made up of former soldiers of the Tsar, intend to bring about a German invasion before the Red Coffin is ready. While Soviet engineers struggle to complete the design of the tank, Pekkala must track down the White Guild and expose their plans to propel Germany and Russia into conflict.