After a three-week break, "Blue Bloods" Season 7 will be back on March 31 for episode 18. This episode is a milestone for the series as it is going to be the 150th episode. Ever since the show started in 2010, it definitely has come a long way.

The show has just been renewed for Season 8, CBS said. The upcoming episode is titled "A Deep Blue Goodbye," and it will show Commissioner Frank Reagan heading an investigation in the Mayor's office. This is going to be big since it involves the Mayor's office, but this is not something new to Frank. Another dilemma that Frank will face involves one of his friends.

Chief Taylor Daniels is not thinking about retirement just yet, even if he has already reached the mandatory age limit at work. He does not feel like his age. However, if he does not retire, he may be forced to do so, and Frank certainly would not like things to go that way.

This will be tougher to deal with because Frank may also be hit with the reality that he is getting there, too, and fans fear that actor Tom Selleck may soon say goodbye. We have previously reported that it won't happen. Also, Blasting News said that the 72-year-old actor Selleck is not leaving "Blue Bloods."

Meanwhile, "Blue Bloods" Season 7 episode 18 will also show Danny working on a difficult case. A former New York Police Department (NYPD) officer goes missing after she said that she and her partner are planning to make amends with a woman who was unlawfully convicted years ago.

For fans that have been waiting for "Blue Bloods" Season 7 to tackle more about Jamie and Eddie's relationship, we may have to wait. Hopefully, the show would show more about them before Season 7 ends.