Josh Lewis and Aaron Zimmer are 11 years old. They go to the exclusive, private Huckley School in New York. Josh`s father has just left home for a trial separation from his wife. This has upset Josh more than his sister Heather, who says she is `nearly thirteen and emotionally fourteen`. Even more upsetting are his friend Aaron`s experiments with computer time travel. Aaron has discovered how to travel into the future and, more importantly, into the past. This book is the story of t`heir adventures in Cyberspace.