The 13th season of Blue Bloods is coming to a close, and in the penultimate episode of the season, Frank will discover himself worrying about a longtime buddy. Frank believes his longtime friend Lenny Ross, played by Treat Williams, is hiding the real reason he came back to the city in Season 13, Episode 20, “Irish Exits,” which airs on Friday, May 12 at 10 p.m. ET. Frank will already be under a lot of stress, and worrying about a friend would just make things worse.

This will mark Treat Williams’ sixth episode of Blue Bloods, being initially introduced as Lenny Ross way back in Season 6. His latest appearance on the CBS procedural was in Season 12’s “Protective Instincts” when Lenny offered Frank a position as chief of security for the NFL. Obviously, Frank decided to turn it down, but now that Lenny is back in town, this raises the question of what other propositions he has in store since, clearly, he’s not being completely truthful.

It’s never easy when a storyline involves a character hiding something from someone else, especially if it could impact the whole storyline. While it does say that Frank only suspects that Lenny could be hiding the truth, it wouldn’t be surprising if his suspicions were right. It’s going to be interesting to see what really brings Lenny to the city and how it could impact the story. With only the finale to go after this episode, anything that happens in “Irish Exits” could possibly set up the Blue Bloods season finale.

Lenny is not the only person to worry about in the upcoming episode. Baez and her daughter are targeted by a criminal, and Eddie’s partner’s ex-girlfriend is physically attacked. The team will definitely be dealing with a lot, and it’s hard to tell how this will all come together and maybe set up the finale. At the very least, if anything does happen that will require a big arc, Blue Bloods is returning for Season 14, so it won’t be so bad if fans have to wait and see what happens.

We can only hope that whatever it is that draws Lenny back to the city won’t be as horrible as Frank imagines. Nevertheless, if there is one thing that can be counted on, it is that having Treat Williams back will be a “treat,” and it will be interesting to see what else he adds to the table. We’re crossing our fingers that this isn’t the last time we see him, but it all depends on how this plot develops.