InvestiGators: All Tide Up

In the seventh InvestiGators book in the series, the InvestiGators take to the high seas to help an incoherent captain drifting out at sea to find his boat. A few questions surround the mystery – did it sink? Where are all the passengers? Are pirates at play? Or did it simply disappear? Mango and Brash must piece the clues together before a second ship goes missing. Can you help them?