Tunnel of Secrets (Hardy Boys Adventures)


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, the boys stumble upon an entire underground city that’s been abandoned for years. Now the city is home to a cultish band of criminals who plan to take over Bayport. Frank and Joe are determined to shut down the crooks, but after being barreled down by a boulder and nearly squashed by a runaway train, they have to wonder: are they in over their heads?

Author(s): Franklin W. Dixon  

ISBN 10: 1481438743
ISBN 13: 9781481438742
Pages: 144
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Other books by Franklin W. Dixon

1. Arctic Patrol Mystery (Hardy Boys Mystery Stories Series #48)
2. Clue of the Screeching Owl (Hardy Boys Mystery Stories Series #41)
3. Crisscross Shadow (Hardy Boys Mystery Stories Series #32)
4. Danger on Vampire Trail (Hardy Boys Mystery Stories Series #50)
5. Disappearing Floor (Hardy Boys Mystery Stories Series #19)
6. Footprints Under the Window (Hardy Boys Mystery Stories Series #12)
7. Haunted Fort (Hardy Boys Series #44)
8. Hidden Harbor Mystery (Hardy Boys Mystery Stories Series #14)
9. Hunting for Hidden Gold (Hardy Boys Mystery Stories Series #5)
10. Mark on the Door (Hardy Boys Mystery Stories Series #13)
11. Melted Coins (Hardy Boys Mystery Stories Series #23)
12. Mystery at Devil's Paw (Hardy Boys Mystery Stories Series #38)
13. Mystery of Cabin Island (Hardy Boys Mystery Stories Series #8)
14. Mystery of Smuggler's Cove (Hardy Boys Mystery Stories #64)
15. Mystery of the Chinese Junk (Hardy Boys Mystery Stories Series #39)
16. Mystery of the Desert Giant (Hardy Boys Mystery Stories Series #40)
17. Mystery of the Flying Express (Hardy Boys Mystery Stories Series #20)
18. Mystery of the Samurai Sword (Hardy Boys Mystery Stories #60)
19. Mystery of the Spiral Bridge (Hardy Boys Mystery Stories Series #45)
20. Mystery of the whale tattoo

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