A dead man's riddles--and secrets--thrust an FBI codebreaker into a deadly cross-country race for justice in a propulsive thriller by the Wall Street Journal bestselling author of The Cipher. During a recent undercover sting gone bad, hit man Gustavo Toro died in the arms of FBI Special Agent Daniela "Dani" Vega. But Toro had secrets he refused to take to the grave. In the event of his death, Toro left behind a...