The Tower Room (Egerton Hall Trilogy 1) - Adele Geras

Megan, Bella and Alice inhabit the isolated world of a girl's boarding school, Egerton Hall, buried deep in the English countryside. The Tower Room which they share is remote and high, and from it the three survey the everyday drama of school life. With only months to go until their final exams they are already sensing the dangerous delights awaiting them in the grown-up world. Megan feels a special poignancy about leaving school; orphaned soon after she came to Egerton Hall, she has virtually been brought up there as the ward of the science mistress.But it is Megan who looks down from the Tower Room that unforgettable morning, to meet Simon's inquisitive gaze. As Megan rushes to embrace her fate, her safe, cocooned world is transformed forever . . .

Loosely based on the Rapunzel fairytale, this highly original novel is the story of a sudden, unexpected, passionate relationship and the unforseen yet inevitable results of defying convention.