Oskar is on the way to his father's funeral and he can't help, but think of the messages is father left him. His Grandmother keeps touching him as they get closer and closer to the cemetary.
In the closet, Oskar knocks over a vase and finds an envelope with a key inside. Written on the envelope is the name Black. This mysterious key is the start of Oskar's journey.
1 New Message from Abby Black
On his journey, Oskar meets many different people. The first was Aaron Black. He wasn't able to come downstairs and Oskar couldn't go up so they never really met. Later, he met Abe Black who made him go on the cyclone. Neither of them knew anything about the key.
Later, Oskar goes to his grandmother's apartment only to find the mysterious renter inside. In reality, this man is really his grandfather.
There was a message from Abby Black 8 months prior about the key Oskar was inquiring about. Oskar was afraid of the answering machine so he found Abby only to find out the key was her husband's.
At the end, we find out that Oskar's mom knew what Oskar was up to. They had a teary reunion and grieved the loss of Thomas together.