Tip of the Iceberg (1970)

Following the devastating news of his colleague's assassination in Hong Kong, CIA operative Mark engages in a relentless pursuit to find her killer. His quest leads him to an underground shadow network lead by the enigmatic "Blackjack" that everyone seems to fear. As he dives deeper, he discovers that the real threat is closer to home than he would have ever imagined. The stakes rise and the clock ticks down. A cat and mouse chase ensues as Mark must confront the ghostly presence of Blackjack head on if he wants to uncover the truth before it's too late.