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Multiple-time New York Times–bestselling sewer surfing super-sleuths Mango & Brash are back in the seventh volume of the mega-smash-hit InvestiGators series!

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!

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!