An exotic visitor sparks mixed reactions in the firehouse; Tommy deals with possible expulsion from the FDNY and a new sponsorship role in AA; Mike and the guys renovate their new bar; Sheila learns that being a big sister is not always easy.
After learning of Colleen's relationship with Bart, Tommy decides that it's time for a talk with his daughter about the birds and bees. Tommy also decides to meet with the French reporter who's writing a book about 9/11, and issues raised by her book lead to friction between Franco and Mike. Meanwhile, Mike hits on a new theme for his bar; Sean seeks out treatment for his bad back; and Tommy meets Sheila's psycho-dramaturge.
Lou wants to cooperate with Genevieve because he's interested in her. She's interested in Tommy, who isn't particularly interested in her, but he does watch some 9/11 footage she gives him, and what he sees is very disturbing. Meanwhile, Mike's bar opens; Sean's back still hurts; and Sheila's psycho-dramaturge tells her to "purge" herself of Tommy.
After a run in with Janet's Brash New boyfriend, Tommy grows concerned about Katie's whereabouts. Sheila is finally able to come to terms with Jimmy's death as Damien makes the decision to follow in his father's footsteps.
A personal milestone finds Tommy back at 9/11, Genevieve's perspective on 9/11 incenses Tommy, whereas Franco's point of view has more dire consequences. Meanwhile, Sean's back pain turns out to be more serious than he had expected and the success of Mike's bar comes a handful.
Tommy and Janet attempt to survive a weekend together at Katy's prep school. Meanwhile, Lou seems Tommy's absence as a way to move in on Genevieve. Teddy and Maggie receive vulgar propositions and Sean's stomach pain acts up at an inopportune moment.
A light night clean-up turns into a nightmare for Tommy when several unexpected visitors stop by the bar. Feinberg allows Damien to ride along with the crew, but may not be prepared for the consequences.
Tension runs high as Needles holds the guys accountable for their lack of judgment. Tommy steps up and takes responsibility for Damian's future in the firehouse. Sheila provides Tommy with an oasis as a sign of her gratitude but it may not be enough to save him from the wrath of Mike, Dwight, and the ghosts of Tommy's past.
Tommy and Mike must lay their differences aside when a roadblock puts a dangerous halt to a routine call. Sheila uses her leverage to control Tommy's drinking, while Lou refuses to give into the allure of an old flame.
Though Tommy's pacts with Sheila and Janet have begun to unravel, there is one Gavin who remains sexually adventurous much to Tommy's chagrin. Garrity divulges his medical secret, Tommy proclaims he has been drinking at AA, but its Mickey who will offer the final surprise.
As Damien joins 62 Truck, Sheila reminds Tommy of his promise to watch out for him. Meanwhile, Janet gives Tommy guidelines for their relationship; the guys attend a memorial dedication for a firefighter who died on 9/11; and Sean is released from the hospital, vowing to live life "to the fullest."
A no-nonsense woman, looking for a date, shows up at the firehouse talking trash; Janet offers Tommy an ultimatum; Needles and Lou concoct a battle of the sexes; Sean's medical condition moves lower on his body.