Comment John Christopher & John Wyndham (Score 1) 1130
The Tripods trilogy (now in four books) is a good set to get your 10-12 year old boys hooked on the genre.
And I enjoy the "cosy catastrophes" of John Wyndham's works - The Day of the Triffids and Chrysalids are his two best known, but the story of the Troon family in "The Outward Urge" is wonderful as well (one of the best SF examples of bluffing at a national level in one of the stories), and my personal favourite was his first posthumous work, "Web" - unlike its predecessors, there's no "Well, things are getting better" at the end...