Gloria Reuben Guest Stars in the ‘Blue Bloods’ Finale as the Reagans Try to Save Joe Hill (PHOTOS)

The two-part Blue Bloods Season 11 finale (airing on Friday, May 14, beginning at 9/8c) is going to be a very personal one for the Reagans: Joe Hill (Will Hochman), the late Joe Reagan’s son, is in serious trouble.

It all begins in “The End,” when Danny (Donnie Wahlberg) discovers that his nephew is working undercover for the ATF in an attempt to bring down a gunrunning organization. As TV Insider previously reported, Gloria Reuben is guest-starring as ATF Special Agent Rachel Weber, who’s in charge of Joe’s undercover op. (It’s a Jesse Stone reunion with Tom Selleck, who plays Commissioner Frank Reagan.)

In the finale promo (below), Danny comes face-to-face with Joe while chasing someone. And it looks like it’s going to be Jamie (Will Estes) who worries that his nephew has been made.

The good news: Joe is a member of the Reagan family! In Part 2 of the finale, “Justifies the Means,” the brood bands together to keep him from being killed in the line of duty like his father. But Joe’s call to grandfather Frank has us worried:

Scroll down for a look at sneak peek photos from the final two episodes of Season 11, including Reuben’s guest spot and plenty of family moments. (Don’t worry — Blue Bloods has already been renewed for Season 12.)

Blue Bloods, Season 11 Finale, Friday, May 14, 9/8c, CBS