"Extremely Loud and Incredibly Close" is a novel by Jonathan Safran Foer that follows a young boy named Oskar Schell as he navigates life in New York City after the tragic events of September 11, 2001. Oskar, who is dealing with the loss of his father, embarks on a quest to find the lock that matches a mysterious key left behind by his dad. The story intertwines Oskar's journey with the experiences of other characters, including his grandmother and a reclusive man named Thomas Schell. Through their narratives, the novel explores themes of grief, love, and the search for connection in a fractured world.