国安三处副处长杨光在一次收网行动中得到情报，有境外间谍组织欲破坏中美两国合作会谈。杨光带领队友前往支援，间谍组织却暗杀我方会议代表，致会谈终止。中美双方合作会议重启，敌方却再度出手杀害我国科研专家，窃取我国机密技术。杨光敏感察觉事态背后定有阴谋，带领三处抽丝剥茧展开调查。无独有偶，神秘女人赵亚苧以国际公关身份若隐若现，敌友难辨。杨光运筹帷幄、重拳出击，成功将境外情报组织赫尔墨斯及其头目山下恒友等人缉拿归案，殊料却被赵亚苧感谢之名构陷，百口莫辩。

Yang Guang, deputy director of National Security Department 3, becomes embroiled in a complex conspiracy involving an international spy organization. As unexpected events unfold, Yang and his team face a potential crisis of leaking state secrets. Amid the turmoil, they investigate a mysterious woman, Zhao Yaning, whose role in the situation remains unclear. Despite facing numerous challenges, Yang Guang remains determined to uncover the truth and protect national security.