Leslie Epstein

Or does she stay loyal to Victor, a heroic resistance leader whose fight against the Nazis is of global importance?

Racking their brains for an answer, Julius and Phil decided to break for the afternoon and took a long drive through Los Angeles.

The twins have written and rewritten this final scene a dozen times already.

They had to eliminate the film's antagonist, Major Strasser, and the hero, Rick, played by Humphrey Bogart, must make a sacrifice in order to facilitate Ilsa and Victor's escape from Casablanca.

It's a miracle, it seems, that the film came together the way it did, with countless lines written in the pressure of the moment that sound as though they've existed forever.

And pitch-perfect wartime messaging at a time when it was still unclear if the Allied forces would prevail.

But what, in the end, was their secret to the making of a masterpiece?

That's the trailer for the Spanish-language film Pan's Labyrinth, which was written, produced and directed by the Mexican filmmaker Guillermo del Toro.

The film tells the story of an 11-year-old girl, Ophelia, who meets fairies, a faun and other mythical creatures in an abandoned labyrinth, a type of maze, on a quest to achieve immortality and return as Princess Moana of the Underworld.

The title of the film refers to the Greek and Roman god Pan, who was a faun, a mythical creature with the legs and horns of a goat, but the torso of a man.

Me!

Cannes Labyrinth was first shown at the Cannes Film Festival in 2006.

It received a 22-minute standing ovation, a record for the prestigious festival.

It then went on to win Oscars, BAFTAs and Goyas, Spain's highest film accolade.

Ivana's first memories of the film are the audition process, when she was selected out of around 1,000 potential Ophelias.

Having been cast, Ivana began working on the role almost straight away with Guillermo del Toro.

The film is hard-hitting and at times violent, with scenes featuring Ophelia's stepfather, the fascist Captain Vidal, hunting down and torturing communist guerrilla fighters.

Guillermo del Toro told the BBC in 2006 why he chose to set the film in 1944 Spain.

And the lasting impression for audiences was great.

But it wasn't just Ivana's acting and the story that impressed people.