Help for the Haunted

I read the book "Help for the Haunted" by John Searles. The book overall was a decent read and I enjoyed it more as the book progressed.
 One thing that stood out to me was the character development. Sylvie Mason is a young girl who's parents help possessed people- and were murdered. In the beginning, Sylvie seems more shy and keeps to herself a lot due to her parents recent death. When Police investigators are ready to put a guy on trial that Sylvie said was the murderer, she says that she really wasn't sure if it was that guy after all, she just felt like the investigators were pressing for an answer so she gave them one. Now that her case is back at the beginning, the clock is ticking for her to find the real killer. As Sylvie tries to piece together that past and present, she learns to deal and love the small things about her reckless sister, who takes care of her. She also becomes braver, not doing anything her parents would have wanted her to. She peeks into the book that made her parents look like fakes, talks to her uncle that her parents never spoke of, and goes on to discover the truth. By the end of the book, she learns to have a better relationship with her sister, becomes braver, and isn't as miserable now that she knows her parents' killer.
Here is a link to further describe the book:

http://www.washingtonpost.com/entertainment/books/review-of-help-for-the-haunted-by-john-searles/2013/09/22/1f953afc-1952-11e3-a628-7e6dde8f889d_story.html