Johnny Rock was the lead singer of The Heathens, a rising rock band from the late 80s/early 90s that broke up following the release of only one album, mainly due to his life of excess. 25 years later, Rock struggles to survive in the music industry. He is given a second chance when his estranged daughter Gigi moves to New York to try to make it as a musician. She comes up with a proposition: if her dad reforms the Heathens, she’ll replace him as lead singer, the band will change their name to The Assassins, and in return he’ll stay on board as lead songwriter for the band, as well as coach to Gigi.
Johnny experiences the challenges of an aging rock star in a music landscape fueled by hip-hop and pop, as well as caring for someone other than himself for once with his daughter back in his life.