Strike of the Shark (Mission Survival #6) by Bear Grylls

When Beck Granger is ship-wrecked in the open seas, he needs all of his survival skills to save a small group of passengers.

But the sinking was no accident. In order to stay alive, he’ll have to work out who wants him dead, and why.

That is, if the sharks don’t get him first . . .

An explosive adventure from real-life survival expert Bear Grylls