CIA cryptographer whose fiancée is murdered by terrorists. He blackmails his superiors into a field assignment to Czechoslovakia to assassinate the perpetrators. Operating alone behind the Iron Curtain, he tracks the terrorist leader, confronts him after a CIA double-cross revelation, and ultimately kills the man responsible for his fiancée's death before escaping with help.
Elisabeth serves as Heller's primary point of contact and logistical support behind enemy lines.
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