In this book, intruders threaten Monty's library. To save it, he must team up with his enemy, Greytail the mouse. Will the unlikely friends succeed? Monty the Library Cat is at Oxford Reading Level 8. It is for readers aged 7 to 11 years old who are working below expected standard in their reading. The Rise series ensures that older struggling readers have books with age-appropriate content and topics, that look like the books their peers are enjoying, but are written at a level they can read successfully.