I remember the only time I went to see a movie where the crowd clapped and cheered was at Independence Day, when Will Smith punched the alien. There is just something so charming about the good old action heroes, especially ones like Will Smith, when they're heroic AND funny, and Alfred Kropp is just like that.  He's definitely a likeable guy you'll root for.
Alfred's parents were dead, and he now lived with his uncle. It sucked to lose your parents for sure, but it sucked even more when everyone else kept reminding you about it. Alfred's school counselor was one of those people who just wouldn't let it go: "Do you hate school, Alfred?" "Do you hate your family from dying?" "Do you hate them for leaving you all alone in this world?"  Man, Alfred didn't know he was supposed to hate and resent so many things.
Then his security guard uncle asked Alfred to help steal something from his boss' office. If they succeeded, this guy was going to give them one billion dollars! Imagine that, Alfred!  But Alfred wasn't so sure. This all sounded pretty fishy to him, but what could he do?  He couldn't say no to his uncle, and he didn't want to anger him and be sent to a foster home.  Seriously! He didn't mean to be an accomplice. He didn't mean to steal Excalibur, the legendary sword of King Arthur. And he definitely didn't mean to give the sword to the bad guys.
An action-packed novel with lots of comic relief. Personality-wise, I like Alfred more than the others from the crop of characters in similar teen novels'.  Rick Yancey is also the author of The Monstrumologist series (so disappointed to see they've changed the look when the second book came out. Why?  The first one was so much creepier!). Check out his website.