Chin Ho and Dan Williams are tracking a safecracker but he pulls a gun and Danno ends up shooting him. McGarrett takes his identity of Harry Brown and must infiltrate a sophisticated gang of international thieves.

A career criminal, Connors, fools McGarrett and the team into protecting the wrong bank, and robs a nearby one, taking the wife of the manager hostage. Things turn ugly when one of his goons assaults and murders her. McGarrett must race to capture Connors before he can do any more damage.

While investigating the death of a security agent at an airport, McGarrett comes into contact with a gang who hijack cargo.

A crazed electronics wizard threatens the lives of a psychiatrist and his patients by using electronic devices and gadgets.

A senior partner in a stock exchange firm comes up with a foolproof plan to rob the Honolulu Stock Exchange.