Up into the clouds

Inspired by Richard Saucedo's band piece into the clouds. Two girls named Lastelle (14) and Ivy (6) set off on an adventure to see the world in a Hot air balloon. Two years prior their parents were out on another adventure to get notes for a new book, but that would be the last the girls saw of them the only thing left of their parents is the book where they kept their drawings and notes on animals except for the last entry.
On this adventure will the girls end up like their parents or will they be able to survive the nightmares and creatures that lay before them?