A group of friends is trying to find their missing friend Justin, who they suspect is PZ9, a member of the villainous Project Zorgo. They receive a note from Daniel, who claims to be Justin's friend, leading them to the Spirit Tunnels. They set up an invisible fence to catch the hackers but fail. As they navigate through the tunnels, they find a black glove, suspecting that PZ9 might be nearby. They follow a sound and come across a tunnel with two paths. After finding a green note that seems suspicious, they compare the handwriting to previous notes from Daniel and conclude that the green note is a fake. They decide to open a box on the right, which they believe will reveal PZ9's identity.
Here are the key facts extracted from the text:
1. The hackers are after PZ9, who is believed to be Justin.
2. Daniel is going undercover to gather clues from the hackers.
3. Daniel will leave clues in blue ink for the others to find.
4. A note in blue ink is found with a message from Daniel.
5. The note mentions going to the tunnels to find PZ9.
6. The tunnels are known as the "Spirit Tunnels" and are notorious for being easy to get lost in.
7. A hacker is guarding the entrance to the tunnels.
8. The hacker is described as being around 6 feet 2 inches tall.
9. A clue is found that suggests Justin may be PZ9.
10. A note in black ink is found, which is suspicious because Daniel's previous notes were in blue ink.
11. The note in black ink mentions setting up an electric fence.
12. The group sets up an electric fence to catch the hackers.
13. A hacker is caught, but it is not clear if it is Justin.
14. A search of the hacker's pockets reveals a note that suggests Daniel may be in trouble.
15. The group decides to investigate the tunnels to find PZ9 and Daniel.
16. They come across a manhole that is too heavy to lift.
17. A black glove is found, which is similar to one found earlier.
18. The group follows the sound of voices and comes across a fork in the tunnel.
19. They decide to go left and come across a series of boxes with notes on them.
20. One of the notes is in green ink and suggests opening the box on the left.
21. However, the group is suspicious of the note because it is in black ink and the handwriting does not match Daniel's.
22. They decide to open the box on the right instead.
Note: Some of the facts may be speculative or based on assumptions made by the characters in the text.