What's the theme of "the body finder?"

The main themes of this story were murder, serial killers, love, friendship, and supernatural abilities. For example, in the story there is murder, the girls are murdered and left one by one. Serial Killers, they must be found so the murders do not continue. Love, Jay Heaton and Violet Ambrose fall in love. Supernatural abilities, Violet can sense the dead, she isn't like everyone else.