Mimi laid the box in the bench and opened it carefully. Inside were rows and rows of coloured pastels that shimmered in the light. She rolled them under her fingertips and her imagination began to fill with amazing pictures. When Mimi is given a box of magical pastels, she discovers that she can draw the Garden of Empress Cassia - a drawing so beautiful and real that people are transported inside it. But the pastels are ancient, mysterious and powerful, and in the wrong hands can be very dangerous . . .