The plot is much more detailed than in the film that I saw yesterday to form an opinion, I finally preferred the book richer and where various adventures are much better fed. It's actually quite fluid and taking: good entertainment for the summer.
In summary: 9 youth (and their guards) from a dead planet, apparently, were sent to earth to escape the assassins who destroyed ... 3 were brutally suppressed in order ... Number 4 is as follows.