Visit Stonehenge, the Bermuda Triangle and Loch Ness in Natural History Mysteries. TreeTops inFact is an exciting non-fiction series for children aged 711. Its range of subjects and careful levelling make it easy to select books that children will love.Visit Stonehenge, the Bermuda Triangle and Loch Ness in Natural History Mysteries. TreeTops inFact is an exciting non-fiction series for children aged 711. Its range of subjects and careful levelling make it easy to select books that children will love.