獻給青少年的英語學習讀物—Building Blocks Library(BBL) ，貼近少年少女煩惱與快樂的故事。
An exciting weekend rafting trip turns into a nightmare as the rafts are swept towards the huge Shadow Falls. Jay is their only hope. Can he lead the boys to safety?
The audio files that accompany this book are available for download from:
Building Blocks Library 是專為學習英語的學生所設計的讀物，由日本 mpi 開發編製而成；mpi 是英語教師培訓與英語教材出版的領先企業。
BBL書籍共分成十一個等級，最高的七級～九級以Sakkam Press 電子書籍方式發行；書中的故事引領讀者進入一群好朋友的生活當中，並隨著各個角色經歷扣人心弦、符合時下現實生活情境的種種冒險。讀者可以分別閱讀每一本書，也可以享讀整套書籍，因為不同等級當中的每個故事都有共通點串連。
About the series:
BBL (Building Blocks Library) is a collection of graded readers for students of English as a second language. These books were developed by mpi, one of Japan's leading providers of training for English teachers and a publisher of English teaching materials.
There are eleven levels of BBL readers and the highest three levels, 7 to 9, are now available from Sakkam Press worldwide as ebooks. These higher levels draw readers into the exciting world of a close group of friends and their compelling and contemporary real-life adventures. Each book can be read independently, but the stories are woven with common threads that tie the books and levels together.
Level 9 takes the friends further into their social groups and wider societies. They find out about things like personal responsibility, fame, jealousy and envy, first jobs, money, social causes and social dangers.