Ruby (Emilia Jones) is a Child Of Deaf Adults (the abbreviation of which gives the film its title – Coda). The only hearing member in her household, she helps her parents (Marlee Matlin & Troy Kotsur) make their living on the family fishing boat, alongside her brother (Daniel Durant). A deeply gifted singer, her life starts to change when she joins a choir run by a tough-love choirmaster (Eugenio Derbez) who believes in her, but does pursuing her dream mean leaving her family behind?