Here is the list of books -1 - The Strange Box2 - Beyond the Door3 - The Jewel in the Hub4 - The Matrix Mission5 - The Power of the Cell6 - The TimeWeb7 - Time Runners8 - Tyler: His Story9 - A Jack and Three Queens10 - Mission Victory11 - The Enigma Plot12 - The Thief Who Stole Nothing13 - Stranger at the Gates14 - The Will of the People15 - Fire in the Dark16 - The Stone of Destiny17 - Making a Bolt for It18 - The Cauldron of DarknessMy youngest daughter was at first reluctant to hear about Biff, Chip and Kipper a few years later - she didn't want them to change. But in no time she was caught up in the story and we have read the first 11 books already even though they only arrived the day before yesterday. The Virans, who are the children's enemy in these stories did scare her a bit - she's rather sensitive though, tending to panic when 'mild peril' comes up in Disney films!I think these books are well worth the money.