Murmur No More

Murmur No More is a young adult mystery about a young girl named Zanni when her best friend is murdered by a serial killer she's unable to let things go so she follows after the killer. She's obsessed with understanding why her friend had to die and why he has to kill. She dreams of the killer as she ventures to to his crime scenes and during this time she makes a friend named Kaede whose father is a police detective. As she gets more involved with Kaede's family and the murders she learns she may have more reasons to chase after the killer than she first thought.