Spellbinder Series by Mark Shirrefs, John Thomson

When Paul Reynolds takes part in a silly schoolboy prank, he finds himself accidentally marooned in another world. It's a world where the Industrial Revolution never happened, and where a powerful group called the Spellbinders are in charge. The group want to capture Paul, but he must outwit them.

Continues on from Riana's World.Using Riana's physical skill and Paul's modern know-how, the three outwit Ashka and Paul finds his way home. In order to save Riana's life, Paul has to drag her into his world. Now Riana, who grew up in a closed rustic community, must contend with the chaos and complexity of our modern world. Her confrontations with technology are both amusing and frightening.To make matters worse, the Spellbinder Ashka finds a way into our world... moreContinues on from Riana's World.Using Riana's physical skill and Paul's modern know-how, the three outwit Ashka and Paul finds his way home. In order to save Riana's life, Paul has to drag her into his world. Now Riana, who grew up in a closed rustic community, must contend with the chaos and complexity of our modern world. Her confrontations with technology are both amusing and frightening.To make matters worse, the Spellbinder Ashka finds a way into our world. She tricks Paul's father into helping her combine Spellbinder technology with our science to make her invincible.The challenge of defeating Ashka requires all of Paul and Riana's courage and ingenuity. less

When Kathy decides to explore an unusual boat she discovers next to a lake, she is accidentally pulled from her home in Australia into a parallel universe. The new world she finds herself in is populated by ethnic Chinese, who possess advanced technology, including a talking computer called "Oracle" that runs the empire.Kathy spends most of her time trying to evade dangerous people, return to her own world, and reunite with her family... moreWhen Kathy decides to explore an unusual boat she discovers next to a lake, she is accidentally pulled from her home in Australia into a parallel universe. The new world she finds herself in is populated by ethnic Chinese, who possess advanced technology, including a talking computer called "Oracle" that runs the empire.Kathy spends most of her time trying to evade dangerous people, return to her own world, and reunite with her family. She is further antagonized by Ashka, a cunning and manipulative woman who has escaped from prison on her own world (for her crimes in the first series) and who seeks to gain advantage for herself. less

In the parallel world of the Land of the Dragon Lord, things go from bad to worse for 15-year-old Kathy Morgan.Ashka, the renegade Spellbinder, steals the interface from the Oracle computer, leaving the land vulnerable for the first time in hundreds of years. Kathy and the scientist, Mek, go after her but the trans-dimensional boat is damaged and they are set adrift in the infinate continuum of parallel worlds.With the Oracle disabled, Sharak and his barbarian army invade... moreIn the parallel world of the Land of the Dragon Lord, things go from bad to worse for 15-year-old Kathy Morgan.Ashka, the renegade Spellbinder, steals the interface from the Oracle computer, leaving the land vulnerable for the first time in hundreds of years. Kathy and the scientist, Mek, go after her but the trans-dimensional boat is damaged and they are set adrift in the infinate continuum of parallel worlds.With the Oracle disabled, Sharak and his barbarian army invade. Sharak plans to become the new Dragon Lord by forcing Princess Aya to marry him. Only Kathy's brother, Josh, and Sun, the ex-Dragon Lord, are left free to stall the wedding until Kathy and Mek return.But Kathy and Mek must survive a world of crazy immortals and a world of killer machines in order to return to the land of the Dragon Lord, restore the Oracle and save Kathy's parents.Then the rescue goes wrong and Kathy and Josh must pursue Ashka to another parallel world where they face their greatest challenge - themselves. less