When Emma sister turns up missing, their family relocates to a trailer part near a forest full of crags.  Here she meets a Jack the One-Eyed talking cat.  Jack swears he can help Emma find her sister, but in order to do so, she must eat a Pride’s Heart, transforming herself into a leader of cats. Together, along with her pride, they embark on a quest into the dangerous, dark forest, filled with evil creatures, to rescue Emma’s sister or die trying.