Charlie Heller is a brilliant but deeply introverted CIA decoder working in a basement office at headquarters in Langley. His life is thrown into turmoil after his wife is killed in a terrorist attack in London. When his superiors refuse to take action, he takes matters into his own hands, embarking on a perilous journey around the globe to track down those responsible. His intellect serves as his ultimate weapon, allowing him to evade his pursuers and carry out his plan for revenge.