"Girl With Gun" is a film about Gwen Hunter, whose best friend Mitzi and on-and-off love Dan thinks she is an ordinary 20-something working woman. In reality, she is the Nightingale, an assassin who helps the innocent when they cannot help themselves. However, her double life leads her to contemplate whether it is worth it, having come so close to death only earlier that morning while on assignment, wondering whether she should just settle down with Dan to lead a normal life like Mitzi's.