Larkspur is a dark action-comedy about a girl gang in post-nuclear Philadelphia. Dr. Odile Seares is an ex-con who escapes into the violet zone with her former classmate, Dr. Gwen Cao, to avoid parole and debt. The two begin working for a Philadelphia street doctor when their lives suddenly become entangled with Deathcamas, an all-girl gang that is at war with a rival gang, the Diamantes.