Nicholas Fisk is an English writer of children's science fiction. His novels include: * Trillions: Tells how the world reacts when thousands -- millions -- trillions of mysterious crystals shower down from space. * Grinny: Three children discover that their weird Great Aunt Emma (who they'd never heard of before she turned up on the doorstep one day) is actually an advance scout for an alien invasion, who's gained some kind of hypnotic power over their parents, and it's up to them to defeat her. * You Remember Me: Sequel to Grinny. The youngest of the children realises that a famous and influential television personality is another alien, but even her older siblings have been got at, so this time it's all up to her. * Starstormers: Five part series. A group of children whose