Blue Bloods will kick off its season season on Friday, September 23. We've uncovered a couple tidbits related to the upcoming episodes to keep fans buzzing over the summer:

1. It will be titled "Mercy."
2. It will focus on the murder of the husband of a friend of Erin's. Look for this character to get upset when she has cover up the crime.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.