My Best Friend and Other Enemies. Catherine Wilkins

When Jessica’s best friend goes off with new-girl Amelia, Jessica is hurt but determined not to take it lying down. She has a plan, and a secret weapon – her felt-tips. The pen is mightier than the sword, after all, and having a sense of humour wins Jessica far more friends than she loses. A funny, wise story that will touch a nerve with everyone who reads it.