Filled with monkey scientists, green rain and more marvellously madcap moments, the ninth instalment in Green's graphic novel series sees the city's water supply replaced with milk and Mango and Brash on the case. The InvestiGators’ latest case is a dairy disaster! The city's water supply has been replaced with milk and the newest feline agents, the InvestiGatos, don’t seem to be complaining. What’s with the monkey-scientists and why is the rain green?! All will be revealed in this sticky volume of InvestiGators!