Initially from the prologue this seems to be a science fiction story about alien invasion however that is really a clever ploy to set the scene where a mountain community is stranded and have to survive with only their own resources. Unlike most "survival / stranded / desert island" stories because of how this is set up civilisation for this mountain community is not destroyed so they have the resources that are there and do not have to build from scratch exactly. Initially the story is set in a teenagers' camp with no adults where a resourceful 13 year old becomes "chief" and leads the camp through a number of adversities. The story is simply written and the problems encountered are too easily overcome but all of the characters and locations are well described so that I can visualise them. Although there is some killing it is not too graphic. I thoroughly enjoyed the book even though there were little twists to the plot it all held together very well and perhaps because the problems were easily overcome it had a feel good factor that is rare these days.