Narrative

Considering the theme of the movie, narrative is the way a story has been put together. A story is a seqeunce of events known as a plot and the narrative is the way these events have been put together to present to the audience. 
The technical Codes in the narrative include: anything to do with camera angles and movement, lighting, sound, props, shot framing and composition, design and layout and editing. these manipluate what the Audeince feels, e.g. sound effects may affect the audiences reaction , lighting and low and high angles may influence what the audeince feel about whats going on.
Verbal codes use  language - written and spoken - and signs contained in graphics. We learn a lot about a narrative from what we are told in this way, but the best narratives show rather than tell, leaving the audience to draw their own conclusions.
Symbolic codes are stuff that we decode ourselves to have our meaning to it , for example a lady in a nice dress in an expensive car ,holding a bag may symbolise shes rich.
Structure suggested by Tzvetan Todorov suggests that all narratives follow a structure with three steps. They begin with equilibrium, where everything is balanced, progress as something comes along to disrupt that equilibrium, and finally reach a resolution, when equilibrium is restored. This may be shown through trailers as well as the actual film.

Example:
Taken 2008
Director: Pierre Morel

Equilibrium: A father sends his daughter around europe for holiday with friend.

Distruption:  The daughte and her friend get trafficked as sex slaves.

Recognition: The father finds out before hand through his daughter being on the phone to him, he leaves his house and starts the search with help from different people , travels around europe looking for her.

Repair: He fights the enemy, finds his daughter and goes home.

New equilibrium: Everything is now at peace and life is back to normal.