Paperback, English. Read but in good condition. Fold on the cover

Oskar Schell, a nine-year-old boy, has not been happy since his dad died in the 9/11 terrorist attacks. Unbeknownst to anyone except for Oskar, on the day of the attacks, Oskar’s dad called the house five times. Oskar was home for the fifth call but couldn’t bring himself to pick up the phone. They never recovered his dad’s body and buried an empty casket at his funeral. Oskar is furious that his mom has started to spend time with a man named Ron and worries that she has begun to move on. Oskar suffers from extreme anxiety and imagines whimsical inventions in order to cope. One night, he decides to look through his dad’s closet and sees a vase hidden on the top shelf. In trying to retrieve it, Oskar drops the vase, and when it shatters, he finds an envelope labeled “Black” that contains a strange key. After doing some research, Oskar decides to visit every person with the last name Black in New York City to try and discover what the key opens.