Back from a successful run in Boston, Eileen, Julia and Tom are blindsided by both personal and professional obstacles as they seek to take "Bombshell" to Broadway. Karen consults her new mentor, Broadway star Veronica "Ronnie" Moore, as she finds herself on the brink of fame, but her success may come at cost to Ivy. A new talent is discovered in an unexpected place. Meanwhile, Derek copes with a damaging accusation.

Partnerships are tested as Eileen asks Tom and Julia to contend with an unwelcome new collaborator, while Jimmy and Kyle prepare to present their work for the first time. Derek attempts to get Ronnie back on his side. Ivy finds it hard to move on, but help from an old friend might take her one step closer to her dream.