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. The discovery of a mysterious scorched letter launches Wolfie and his volcanologist mother, Isabella, on a thrilling adventure around the world's volcanoes.

From Pompeii to Antarctica, they face beauty and danger in equal measure in their quest for the treasures of the volcano.

This exciting adventure story is written by Hawys Morgan. Lime Plus/Band 11+ books provide challenging plots and vocabulary as well as opportunities to practise inference, prediction and reading stamina. Pages 46 and 47 allow children to re-visit the content of the book, supporting comprehension skills, vocabulary development and recall. Ideas for reading in the back of the book provide practical support and stimulating activities.