Silver World. The Silver Sequence, #3

'McNish has an extraordinary, inventive mind, matched by his skill in translating ideas, characters and raw emotions onto the page ... Silver World offers a wholly satisfying conclusion to the trilogy ... takes the reader into uncharted territory, manipulating language in the most extraordinary way.' The Guardian Millions huddle in Coldharbour, waiting for the huge and terrifying Roar. Milo, the silver child, is the first line of the Earth's defence.
Under his wings, Helen probes the Roar's mind, while the twins, Emily and Freda, struggle to free the mysterious Protector. Walter's task is the hardest of all - keeping the others alive for long enough to find a weapon to defeat the Roar. Only Thomas can release that weapon - if he can finally discover the true purpose of his remarkable gift. But a second enemy is also ranged against them. As the Roar approaches from space, her firstborn, Carnac, is crawling from the depths of the Earth.
Only a small number of children, the drill-handed Unearthers, led by Tanni, stand in his way.