John Green

S.U.I.T. headquarters is under attack, and Mango and Brash are going undercover and underground disguised as city sewer workers to unclog a sticky situation. But when their search for the criminal Crackerdile backfires, the toilets they travel through back up--and the InvestiGators take the blame for it! Can Mango and Brash restore their good name and put the real culprit behind bars before the whole city is in deep water?

"The zoo isn't what it used to be. It's run down, and Hippo hardly ever gets any visitors. So he decides to set off for the outside with his friend Red Panda. To make it in the human world, Hippo will have to become a Hippopotamister: he'll have to act like a human, get a job, and wear a hat as a disguise. He's a good employee, whether he's a construction worker, a hair stylist, or a sous chef. But what he really needs is a job where he can be himself"--Amazon.com....

"When a cruise captain is found drifting at sea and delirious, the search begins for his missing ship and passengers! Did it sink? Was it boat-napped? Are supernatural forces at play? And can the InvestiGators unravel this maritime mystery before a second cruise befalls a similarly unfathomable fate? Seas the day and find out in this new nautical adventure!"--