This was a good follow up to "Witness". Finch and Reese are tracking a spy. The action and suspense are intriguing. We have more building up of character development between Reese and Finch.
There was also a flashback detailing Reese's past a little as him and a partner were trying to find out how a terrorist got out of the country.
Pretty soon Detective Carter and Reese will come face to face again and that will be good to see.