Seventeen-year-olds Daisy, a talented violinist with cerebral palsy, and Noah, a great cellist with severe anxiety, plan to use the holiday concert to land a Julliard audition, but when they are chosen to play a duet, they worry their differences will sink their chances.

Helen has won a place at a prestigious summer music school in remote north-western Scotland. But as she practises for a concert on Midsummer's Eve, her friends, the fabled beasts, prepare for battle -- in the very forest where the young musicians are staying. When Yann the centaur arrives and warns Helen of impending danger, she is forced to cast her musical ambitions aside. Helen finds herself catapulted into a perilous quest, allied with fantastical...