Below the Surface by Tim Shoemaker

Something is wrong with Cooper. He’s plagued by a fear he doesn’t understand and can’t control. Cooper just wants to escape, and a summer vacation aboard the restored cabin cruiser, The Getaway, with best friends Gordy, Hiro, and Lunk seems like the perfect way to do it. Two weeks of fun—with no mysteries or life-and-death danger. That’s the plan.

But their plans are shattered the very first night when they witness a murder. Or did they? Despite their intentions of leaving the investigation to the police, narrow misses and creepy encounters lure them in. Is there really a body floating in the underwater currents of the lake? The closer they get to the truth, the deeper into danger they get. Too late they see the trap. Now each of them must face their own buried fears . . . just below the surface.