The one person who gets him is gone. All he has to remember his father by is a few mementoes and the answering machine with his dad's final anxious messages after the terror attack.
Oskar is looking for something to keep his father alive in his mind.
Snooping around his father's closet, Oskar discovers a key and a name: "Black". He thinks his father has left him a puzzle with a mystery reward at the end if he can find the hole the key fits.
And so begins his journey of discovery across the boroughs of New York city. Along for the ride is his grandmother's boarder, "The Renter" (Academy Award nominee Max von Sydow).
In a bizarre way, they form a tight bond as The Renter helps Oskar move past some of his hang-ups.
Fighting his instinctive reluctance to talk to people, Oskar seeks out and finds hundreds of people with the name Black across the city. He shares his heart-warming story with each one of them and seeks answers.
But although he makes wonderful friends, he gets no nearer to unlocking the mystery.
Only when all hope appears lost does an unexpected piece of information come his way.
Extremely Loud and Incredibly Close is not destined to be a mainstream box-office hit. But it is a magnificent movie that tackles the issues of 9/11 and autism with delicacy and warmth.
It provides a moving insight into what life must have been like for New York families during and after that catastrophic day.
Extremely Loud and Incredibly Close
Running time: 129 minutes
Stars: 4.5 / 5