Primary school students' favorite puzzle bridge book
Butt Detective Bridge Book Episode 5
Butt Detective Agency received a time-limited letter containing only one "SOS" letter and a map. Butt Detective and his assistant Brown arrived at a collapsing ruin in the jungle, which was full of various traps. Who is this mysterious client? What kind of event is behind the letter for help? How can Butt Detective find the client, uncover his true identity, and uncover the mystery of the "treasure" of the ruins amidst numerous obstacles?