Case of the Mysterious Happenings — Christy Scollin

Strange things are happening in the small town of Rocky Mountain View and the town folks are scared. Nine-year-old Presley Pickens is once again on the case! After finding a small engraved locket with the picture of a young girl buried in the dirt near the train tracks and surrounded by drops of blood, Presley and her faithful dog Argo follow the trail of blood to a locked door hidden in the depths of the underground library parking lot. From here the mystery begins to open up.
Presley, Argo and Presley's best friend Ashly find a code on the butterfly graffiti that they're able to decipher. This code leads them to a very old man who knows of the secrets of the town's past, and reveals to Presley and Ashly that there are hidden tunnels that run under the streets of Rocky Mountain View and ghosts that haunt them. Once they learn the real truth about these tunnels and who is really haunting them, they must work quickly to save some very innocent victims, before it's too late!