Summer children's Books: Teenagers - Telegraph Mortal Chaos by Matt Dickinson Oxford University Press, 286pp, £6.99 Slick as an oil-spill, and equally combustive, this yarn for mid-teens takes chaos theory as its basis: a butterfly's first movements cause a chain reaction that brings destruction and death. Gripping. A Face Like Glass by Frances Hardinge Macmillan, 488pp, £12.99 More thoughtful teens will revel in this complex novel about an orphaned girl who lives in an underground world where cheeses have magical powers, wines can kill you, and the Grand Steward is schizophrenic. The Changeling by Philippa Gregory Simon and Schuster, 265pp, £12.99 More conventional but unputdownable, this novel is set when people felt the world was going to end. Luca, an intelligent (and handsome) monk, must discover what people fear. And there's a saucy bath scene. Philip Womack is the author of The Other Book and The Liberators.