Eoin Colfer generally writes science-fantasy appropriate for older kids / young adults. See: "the Supernaturalist", the Artemis Fowl books, the WARP trilogy. "

Eoin Colfer generally writes science-fantasy appropriate for older kids / young adults. See: "the Supernaturalist", the Artemis Fowl books, the WARP trilogy. "Escape to Witch Mountain" (by Alexander Key) is a classic.