Craig is ten years old. He lives on the outskirts of the city, which borders a forest. Life here moves slowly and steadily, so most of his free time he spends with his best friends Kelsi and Jay Pi. Perhaps Craig would have continued to play with his friends every day, watch TV, and read books, if one day he hadn't lost one very important thing to him — it accidentally fell into a sewer pipe. The boy asked for help from his best friends, and the guys set off in search of the entrance to the sewer. Thus began their dangerous adventures.