Big Cat for Little Wandle Fluency -- Whodunnit?

Harry, Nazreen, Lily and Raj are a tight-knit group of friends, united by their love of jokes and pranks. However, when the reception class's play area is destroyed in what looks like a deliberate act, the deputy head automatically suspects the usual pranksters. They are determined to prove their innocence, but will they be able to find the proof they need in only twenty minutes of break-time?!