Hawaii Five-O (1968)

S01E19 One For The Money

The discovery of a murdered girl, marked with the number 'one', leads McGarrett to believe a serial killer is on the loose. As he investigates, it becomes evident that the killer is specifically targeting individuals connected to a certain company. The focus soon shifts to two brothers who are poised to inherit the family business from their elderly aunt, raising questions about their potential involvement in the heinous crime.