Birdy by Jess Vallance

A darkly compulsive tale of friendship and obsession.

Frances Bird has been a loner for as long as she can remember. But when she is asked to look after the new girl at school, the sparky Alberta Black, they soon become inseparable, doing everything together, and even creating their own sign of togetherness - a blackbird. After a while though, Bert wants to do things without Frances, and see other people without her there. And that won't do...No that won't do at all...