Book excerpt: KATE KRISTOPHER WAS THE LAST OF A FAMILY DYNASTY OF EXPLORERS. THEN SHE QUIT. TEN YEARS LATER SHE DISCOVERED SHE'S ONE OF WHO-KNOWS HOW MANY SIBLINGS. THE OLDER SISTER SHE NEVER KNEW, KALLIYAN, IS AFTER KATE'S SEEMINGLY ALIVE FATHER AND HAS FORCED KATE TO HELP HER FIND HER MOTHER, THE ONLY PERSON WHO KNOWS WHAT'S UP WITH THEIR DAD. MOM'S LOCATION? THE WORLD OF DREAMS. AND IT'S NOT GOING WELL.