This is probably Jerry Spinelli's best book, and one I read over and over as a child/young teen. The story is real, relatable, and hilarious, as well as touching and heartfelt.
And, the story is a "he said, she said", going back and forth from siblings Greg and Megan's points of view, so that no character is one sided, one dimensional. Megan and Greg, on the cusp of adolescence, can't seem to get past their own petty feuding with each-other, and unfortunately for their family and friends, bring everyone down with them!
But, when Megan suffers a tragedy, will Greg realize how much he really loves "Megamouth", and would do anything to protect her? Will Megan realize how truly important her family is to her, realize she's truly loved, not just "the middle child"?
Anyone between the ages of 12 and 17 should read this story, and honestly-- if you're a parent and have two kids who can't seem to get along, this book might make you feel better. :) (They should completely make this into a movie.)