Fishin': Impossible (Shark School, Bk. 8)

Rick Reef, Harry Hammer's archenemy, is missing from Shark Point! Luckily for Rick, Harry is on the case. His all-time favorite TV show, Mike Hammerhead, Shark Detective stars a fin-tastic detective who never fails to solve under-the-sea who-dunits, and now Harry finds himself in similar water. Will he ever see Rick Reef again? Or has his nemesis disappeared into the dangerous, dark depths forever? Can secret agent Harry save the day?