His whole nation is celebrating what is the worst day of his life

Nineteen-year-old Billy Lynn is home from Iraq. And he's a hero. Billy and the rest of Bravo Company were filmed defeating Iraqi insurgents in a ferocious firefight. Now Bravo's three minutes of extreme bravery is a YouTube sensation and the Bush Administration has sent them on a nationwide Victory Tour.

During the final hours of the tour Billy will mix with the rich and powerful, endure the politics and praise of his fellow Americans - and fall in love. He'll face hard truths about life and death, family and friendship, honour and duty.

Tomorrow he must go back to war.