When I first started reading Extremely Loud and Incredibly Close, it reminded me of The Curious Incident of the Dog in the Night Time by Mark Haddon. The main characters in both books are rather similar: they are young boys who are both socially awkward. But from the first chapter, I knew that I would enjoy Extremely Loud and Incredibly Close a lot more than The Curious Incident. It was funnier, and overall a better story.
Extremely Loud is the story of Oskar Schell. His father is killed in the Twin Towers. While snooping in his dad's room afterwards, Oskar discovers a strange key hidden in a vase. He decides to embark on a quest to discover what the key opens, even if he has to open every lock in New York City!
At the same time, this is also the story of his family. His grandfather left his grandmother when she told him she was pregnant. Interspersed throughout Oskar's story are chapters written from both of his grandparents' perspectives trying to explain why things happened the way they did. These narratives were just as interesting as the main story.
While Extremely Loud and Incredibly Close was rather different from what I normally like to read, I really enjoyed it. If you're looking for something different, then I recommend giving it a try!