Hardy Boys Adventures Collection Volume 4: Shadows at Predator Reef, Deception on the Set

Shadows at Predator Reef
Diving into deadly waters...
The world's largest reef exhibit is coming to the Bayport Aquarium. Frank and Joe are stoked for the unveiling of Predator Reef, a three-hundred-thousand-gallon tank that houses small sharks, rays, and thousands of colorful fish. It's also home to the aquarium's new mascot, Captain Hook - a rare and valuable, five-hundred-pound, giant sea turtle.
But instead of a big reveal, the boys get a big disappointment: Captain Hook has gone missing...