Switching on the opposite

A girl called Katie Adams is going to move from Wales to Barcelona (Spain). When she is on the plane to Spain she gets to "know" four teenagers more or less of her age. She'll get to meet all four boys better when she gets to Spain, at school or at another place. During the first term of school poor Katie has an accident an accidentally bumps get head which causes the loss of her memory. How will this affect school? And her? And her family? But that isn't all she will do, she will change a bit the school when she has in her mind these two questions: why are we the nerds? And why is it bad?