When they first arrived, they came quietly and stealthily as if they tip-toed into the world when we were all looking the other way.Ade loves living at the top of a tower block. From his window, he feels like he can see the whole world stretching out beneath him.His mum doesn t really like looking outside but it s going outside that she hates. She s happier sleeping all day inside their tower, where it s safe.But one day, other tower blocks on the estate start falling down around them and strange, menacing plants begin to appear.Now their tower isn t safe anymore. Ade and his mum are trapped and there s no way out . . .