Oskar Schell (Thomas Horn) is a peculiar nine-year-old boy, suffering from grief above all, but also an undefined behavioral disorder – likely Asperger’s syndrome (despite the film specifically addressing a diagnosis as inconclusive). His father Thomas (Tom Hanks) died in the September 11th attack on the World Trade Center, and Oskar has been unhealthily coping for a year. He’s almost estranged from his mother (Sandra Bullock) and has difficulty functioning in the real world. He’s unusually intelligent, but frequently distressed at loud noises, the sights and sounds of New York, public transportation, and bridges. Yet he’s fearless when it comes to leaving his home to travel around the city alone on foot.
While snooping in his father’s closet for the first time since his death, Oskar discovers a key inside a small envelope, with the name “Black” written on it, inside a blue vase on a high shelf. He determines it’s his destiny, his mission in life, to locate the lock box in which the key fits, if only to stretch out the fading memory of his father, which he correlates to the comparable eight minutes it would take the world to realize if the sun were to explode (based on the speed of light). Reasoning like his father, Oskar plots out an expedition to track down every person with the name “Black” in the outlying area to ask him or her personally if they knew Thomas Schell (for some reason, he doesn’t think to simply use the phone). He estimates a mere six minutes with each person, journeying only on Saturdays, but his list is so lengthy that it will still take approximately three years to complete. At first he refuses to travel by subway or train, resorting to walking everywhere. But when he meets a mysterious, elderly man (Max von Sydow) known as “The Renter” who stays with his grandmother, Oskar gains a fellow searcher on his quest – and one who acquaints him with the convenience of modern traveling technologies.