On this week's Person of Interest...
Reese tries to leave, but the Machine gives him a mission on an airplane protecting a relevant number.
Reese reluctantly helps, fighting of killers trying to murder a computer programmer who created a website for drug trade. The government wants him to dead to cover up their involvement.
Shaw meets with Hersh.
Reese saves the day and realizes his importance to helping all, not just the relevents.
Finch reveals that he created the Machine in the way he did so that humans would be the ones to help determine the fate of others.
Reese rejoins Finch and the two go home to get back to work.