Dr. Finn Jefferies (Brooke Johnson) and her 11 year old daughter (Maya Ritter) are both recovering from the death of Nancy (Gail Maurice, Johnny Greyeyes), Finn's partner and Zelly's biological mother. Finn is lost trying to be everything to Zelly as well as maintaining her workaholic lifestyle, while her daughter acts out by smoking pot and shoplifting with her friends.

Zelly's father (Richard Clarkin) threatens to take custody, questioning Finn's parenting skills, and her hot affair with a younger coworker also seems headed for disaster. Mother and daughter have a lot to work through, and it is unlikely events that finally bring them closer together.

Finn took over Nancy's practice at a Toronto abortion clinic, and when anti-abortion extremists attempt to assassinate her as she drives away on her motorcycle, Diana Peris (Yanna McIntosh) is one of the police officers assigned to protect both home and office. While Diana is also critical of Finn's parenting style, she forms a bond with Zelly and spends overtime at the house.

Intrigued with one another, Diana and Finn begin to build a relationship in the face of danger from snipers. Mixing the issues of single parenting, lesbian life, the politics of abortion, and the tension of a murder attempts, Finn's Girl is extremely well-acted and combines these themes easily. This personal drama will impress you with its treatment of these issues and grab your heart with wonderful characters you'll be rooting for.