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InvestiGators #7: All Tide Up Douglas Holgate and how to defeat them…throughUnsinkable 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 cant be wrong dont 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