When Rosie inherits a Mind Traveller's locket from her mother she is transported to Mind Space and thrown into the angel wars. With help from Elissa of the Special Angel Services, the SAS and three village boys who have been accidently transported with her, she joins with the Knights of Lous in battle against Hisdrillo the Dark Angel and his Grolack tree monsters. Rosie is warned that if the sand in her locket runs out, she and her pals will be trapped...