Collins Big Cat supports every primary child on their reading journey from phonics to fluency. Top authors and illustrators have created fiction and non-fiction books that children love to read. Book banded for guided and independent reading, there are reading notes in the back, comprehensive teaching and assessment support and ebooks available. Marcus is delighted to become the apprentice of the scientist Professor Digory Kranium. He is even more excited when he learns that the Professor has invented a mind-swap machine. The only trouble is, Marcus can’t resist investigating for himself… Ruby/Band 14 books give increasing opportunities for children to develop their skills of inference and deduction. Ideas for reading in the back of the book provide practical support and stimulating activities.