The book started off with humor, suspense, and great potential for both Jane and Slade, but by the end, I felt frustration because we never really get a satisfying answer to Jane's past, and the romance between Jane and Slade seemed...off.
Throughout the book, Jane was contrary to the point of annoyance, and answers; such as what happened to her mother, why she hasn't dealt with the abuse she suffered at the hands of her stepfather, what she planned as revenge for her stepfather, and her powers of invisibility, is never explained to the point of understanding or satisfaction. Jane wouldn't even talk about her past, even though Slade tries several times to get her to open up to him, but she only talks to him about her work or the Sanctuary. In the end, I was left with more questions than answers, which tainted the rest of the book for me.