Nick Jandl

Casey and Severide find themselves at odds after Casey argues about how to save a teenager entangled in barbed wire; Otis tries to convince Casey to participate in the beta test for an expensive piece of new firefighting equipment.

When Juliette becomes so focused on her album that she puts it ahead of everything else, Avery makes a major decision; Rayna and the girls stand by Deacon as his life hangs in the balance.

Rayna tries to help Deacon; Jade (Christina Aguilera) throws a party at her house that turns into an all-night bash; Juliette wants to reinvigorate her career with an impromptu rooftop concert; Gunnar receives news that changes everything.

Juliette hits a career high, including singing a duet with Steven Tyler, but her personal life plummets; Avery takes care of baby Cadence at his parents' home in Texas; Rayna deals with the aftermath of Deacon's liver transplant.

While Juliette enjoys the attention following her rooftop performance, her team worries she is suffering from postpartum depression; Will learns his private life is about to be splashed across a tabloid; Deacon and Rayna grapple with his diagnosis.

With the arrival of his former fiancee in Nashville, Jeff finds himself face-to-face with Jade St. John (played by Christina Aguilera). A powerhouse pop-star in Nashville on tour, Jeff is forced to revisit his past and work with the woman who once played a large role in both his personal and professional lives.