J. S. Volpe 
Into the Woods [EPUB ebook] 

The Anomaly Hunters saga begins here!
When high school seniors Cynthia Crow and Calvin Beckerman set out to investigate the disappearance of Cynthia’s little sister Emily, they aren’t prepared for the surprising twists and turns that await them. They soon find themselves under the tutelage of Robert May, an elderly anomaly investigator who believes that Emily’s disappearance is connected with a string of bizarre and possibly paranormal tragedies stretching back two hundred years. The group’s dogged pursuit of the truth uncovers shocking secrets and terrible crimes, and brings them face-to-face with a mysterious force that will change their lives—and the world—forever.