Title: Shadows at Predator Reef
Description: When a two-hundred-pound sea turtle goes missing from the Bayport Aquarium, Frank and Joe Hardy investigate, discovering a network of underground tunnels hidden beneath Bayport that is aiding a sinister smuggling ring.
Subjects: Mystery and detective stories, Juvenile fiction, Smuggling, Brothers, Public aquariums, series:HardyBoys, collectionID:HBadv, Children's fiction, Crime, fiction