Gilbert Morris 
Empress of the Underworld [EPUB ebook] 

I’m not going! Abbey declared, And that’s final! Their spiritual leader, God, has issued another assignment, and the Seven Sleepers are off and running. Well, most of them are, but not Abbey- not this time. How can Abbey know that she is about to make the biggest mistake of her life? Even now the mysterious Empress of the Underworld is plotting to destroy both Abbey and her unsuspecting friends. How can she know that the wicked Empress makes slaves of all who enter her underground kingdom? How can she know that even she will soon come under the Empress’s magic spell? And how can she know that her disobedience will endanger not only her life, but the lives of the other Sleepers as well? Through some difficult experiences, Abbey learns that God can be trusted and that His lessons are worth learning.