Tunnel of secrets

When Frank and Joe set out to explore caves and tunnels, they dig themselves into some dark and dangerous trouble in this Hardy Boys adventure. When a sinkhole opens up and swallows one of Bayport's historic statues, Frank and Joe suspect something -- or someone -- shady at play. They jump at the chance to investigate; Joe as a member of an urban exploration club, and Frank as photographer for the school paper. But in the thick of their search, t...