Cara is on a quest to the Centaur’s valley to get a story about the Whisperer to figure out who it is and where it came from. Cara’s father is also on a quest to find Cara’s mother and rescue her from the rainbow prison.
In Cara’s quest she gets attacked by delvers and gets thrown in an underground dungeon. There she meets a delver that was charged for treason. They escaped together and got out alive. On Cara’s dads quest he has found some friends that accompany him on his journey to the rainbow prison.
The climax of the story is when Cara achieves her goal and obtains the story of the Whisperer. The price she had to pay for the story was unthinkable. Cara makes her way back to the queen of the unicorns to tell her the story of the Whisperer. She has to make haste before the hunters come and hunt down the unicorns to extinction.
Craig says the book ends with a cliff-hanger - he can't wait to read the next one in the series!