The largest diamond in the world, The Big Dazzle, has been stolen. Doctor Kruft's Obey Ray has also gone missing. Could the two be linked? Pip and Kit try to find out. Using the world's largest known database of writing for and by children, our experts have defined 300 ambitious words to help children succeed at school. We've combined these with finelly levelled books that help you develop support comprehension and fluency, while inspiring and engaging your young readers.