Seven-year-old Lottie knows everything about everyone. She snoops, she spies, she eavesdrops. But when the beloved Crabtree School cat goes missing, can the greatest detective in Year Three crack the case and find Lady Lovelypaws before it's too late? It won't be easy, but Lottie has a plan. The first step? A sleepover at Crabtree School! In the fourth instalment of the Crabtree series, readers can join Lottie, Ava, Zoe, Isabel and Rani for a bit of mystery and - of course - a midnight feast!