Kathleen Bell 
Another Dimension – Friend or Foe [EPUB ebook] 

In this new adventure, keeping their secret just got a whole lot harder. Lee has his Portal Travelling Device stolen, and to get it back, they must risk travelling to a dangerous location.Then Katy and Lee find themselves drugged and taken to another dimension, and it »s up to Tiffany to try and save them.And is Judy about to find out their secret?Then Lee gets news of his Dad, who has been missing for a year, but finding him may not be so easy, and now his friends are starting to go missing too.