The film documentary focuses on a lioness named Ma di Tau ("Mother of Lions") as she battles to protect her cubs against the daunting onslaught of enemies to ensure their survival. The underlying message of the film is on the low population of large cats in the world and whether or not Ma di Tau and her cubs are among the last lions.The film is narrated by Jeremy Irons. Irons also narrated Eye of the Leopard, a 2006 National Geographic film.