The Shapeshifter's Secret Series by Heather Ostler

Like any sixteen-year-old, Julia’s used to dealing with problems. From her overprotective father to her absent mother to a teacher who definitely has it in for her. But everything changes when Julia’s reactions become oddly vicious and angry―more animal than human. This action-packed adventure has it all: humor, romance, and a plot that’ll keep you guessing to the very last page.

Julia's life has gone from complicated to nearly impossible! When Julia loses her shapeshifting powers and her appearance changes in alarming ways, she flees to Sirenity, where she learns an incredible secret about her mother. In this thrilling sequel, Julia must take greater risks and make bigger sacrifices as she discovers who she really is and what she can really become.

18-year-old Julia Levesque is returning to Lockham Castle for her third and final year of shapeshifting school. She’s become a powerful werecat, completely embraced her siren side, and has found true love; but her problems are far from over. Julia is the lead candidate to become ambassador of Ossai, her world, in the hopes of ending the reign of the evil Guild. With her estranged mother as the Guild’s dictator, she knows it won’t be easy... more18-year-old Julia Levesque is returning to Lockham Castle for her third and final year of shapeshifting school. She’s become a powerful werecat, completely embraced her siren side, and has found true love; but her problems are far from over. Julia is the lead candidate to become ambassador of Ossai, her world, in the hopes of ending the reign of the evil Guild. With her estranged mother as the Guild’s dictator, she knows it won’t be easy. She’ll have to travel to Darkwood Castle, a sinister and hopeless palace in order to stop her mother from destroying Ossai. Julia must find a way to save her world—and those she loves most. Otherwise, they’ll both be lost forever. less