The Transall Saga (also known as Blue Light in the United Kingdom) is a 1998 novel by Gary Paulsen. It is a survival story like most of his other books, but also involves the science fiction genre with its post-apocalyptic setting.
The story begins with Mark Harrison, a 13-year old survival enthusiast, hiking through the mountainous Magruder Missile Range when he is struck by a mysterious blue beam of light. He wakes up in a strange world that he believes is an alien world with many similarities to Earth. He uses his survival skills to live off the land and, while exploring the forest, he discovers a camp of some short human-like creatures with webbed feet and dark, olive-colored skin, though he finds them too warlike to interact with.