The Case of the Adder That Didn't Add Up

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. Levelled for guided and independent reading, each book includes ideas to support reading. Teaching and assessment support and eBooks are also available.


A poisoned mouse. No witnesses. No weapon. No footprints. With the evidence pointing to one suspect, Sly is eager to solve her first case and make an arrest before time runs out for poor Molly. But for Detective Snooper something doesn’t quite add up …


Emerald/Band 15 books provide a widening range of genres including science fiction and biography, prompting more ways to respond to texts.


Text type: A mystery story


Ideas for reading in the back of the book provide practical support and stimulating activities.