No one can solve puzzles better than William Wenton! However, when he cracks an allegedly unsolvable code, he is kidnapped by mysterious strangers and taken to the Institute for Posthuman Research. Here, he learns that he is one of the so-called candidates whose task is to protect the world from the dangerous Luridium. To assist him, he has an Orbis, a kind of flying sphere that constantly changes its shape and size. But William seems to have overwhelmingly powerful opponents, and a race against time begins.