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Buck has spent years letting the 118 believe he was just a guy with a messy past and a lot of odd jobs before becoming a firefighter.
But the truth is bigger.
Before the 118, Buck belonged to an elite SEAL team. The kind of team that became family. The kind of team that saw things they still do not talk about.
Jay, TK, Steve, Hondo, Jason, and Buck survived ten years together.
Then one final classified mission broke everything apart.
Buck left that life behind and tried to become someone new.
But when Jay Halstead shows up at Station 118, Buck realizes the past is not finished with him yet.
And neither is Lena Carter - the woman who knew him before everyone else did.