Saoirse Ronan creates such a compelling coming of age teenage girl that her performance elevates this film into the stratosphere. The supporting cast excels throughout with Laure Metcalf, Tracy Letts, Lucas Hedges, and Timothee Chalamet (from Call Me By Your Name) And finally , Greta Gerwig brilliantly whips this movie together without you suspecting this is the first film she has written and directed.