"Like the heroes of Dav Pilkey’s “Dog Man” or “Captain Underpants,” the InvestiGators are bound to resonate with kids." —School Library Journal

Unsinkable detectives Mango and Brash are back in InvestiGators: All Tide Up, a high seas adventure that takes the hit series by John Patrick Green to uncharted waters! Three million readers can’t be wrong – don’t miss the boat!

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!