Rebecca `Becky' Yaeger's plans for the evening did not include being attacked by a psycho who sprouts claws and fangs.  It was supposed to be a fun filled evening with friends at a masquerade party but instead she's fighting for her life and all of a sudden her life is irreversibly changed.  She certainly never suspected that her friends and Simon, the man she loves, have the ability to shift into Pumas.  Sure she wants Simon but eating cat chow and using a litter box holds absolutely no appeal so what's a girl to do?