Sylvie Bartram lives alone with Mr Jackson the dog and her eccentric composer father who invents strange and wonderful musical instruments. One day she returns from school to find a message left in toothpaste on the bathroom mirror; her father has been kidnapped. Later that night, the house is visited by a terrifying apparition - a half-man/half-creature who is searching for something and will not rest until he has found it . . . Sylvie uncovers an underground world of magic and evil, and with help from her friends, she must hold off a power that threatens the lives of all beings in the world. The Songman is at large, and is determined to steal music and use it for his own evil ends . . .