This documentary is terribly personal. The story is that Diane Polley, the director’s mother, died in 1990. She was an actress and a very lively person, bubbly and easily getting in trouble. What Diane Polley left behind is different memories and a big dinosaur in the family closet. Since she is now gone and no longer can explain the choices she made, her daughter, Sarah Polley, sets out to talk to everyone who was close to her mother, and make sense of the dinosaurs.