Susan Cohn Rockefeller’s film Making the Crooked Straight, about Dr. Rick Hodes, won the Moving Mountains Prize in 2009. The director returns with a very different film, a personal yet allegorical tale about the state of our troubled oceans. More traditional films have been made about the science of the subject, so her hope with Mission of Mermaids is that the mythical creature — a symbol of mystery and hope — will inspire our hearts to save the seas.