Its his birthday next week and so I don't have time to read them all first to check them. I've read (and enjoyed) the hunger games trilogy but feel the content is too old for DS1 who will be 10. I wouldn't let him read the Gone series either. He is a good reader, currently loves the mortal engines (predator cities) series, adored City of Ember. Are the maze runner books ok or too old (given my strictness
)?