Summary of "big mouth and ugly girl"

The book “big mouth and ugly girl “tells a story about the boy Matthew Donaghy (big mouth). He is at the Rocky River High School in Westchester County (USA) and he is a well known person there.
On a January morning some detectives come in and take Matt with them. Nobody knows why: Matt is arrested now, because he wants to blow up the school. While that happens, Ursula Riggs (ugly girl) plays basketball with the school team. Because she makes a mistake, the RRHS (Rocky River High School) basketball team loses against Tarrytown. Now are both (Matt and Ursula) depressive and nobody can see them. Ursula helps Matt to show Matt’s innocence. Both get better friends and write lots of e-mails to each other. Ursula plays again in the RRHS basketball team. Some days later all seems to be good, but suddenly the fire alarm rings at school. A mysterious caller says: “I’m Matt and I will light a bomb at school!” (Like at the beginning of the book). Matt brings himself in safety, because all the others think, he was the "bad guy". Shortly after that, everyone knows it: the mysterious caller is reverend Brewer! Therefore Brewer is arrested now. After all these actions, the old friends are suddenly very friendly to Matt again. But he knows: real friends help each other every time. Matt and Ursula have lunch together at their favourite place: the nature preserve. They have their first kiss and everything is fine.