Patricia Robinson 
Vengeful Spirit [EPUB ebook] 

A joke Internet séance leads to horrific results, as the participants die one after the other. Three teenagers with a shared secret are forced to reunite after many years to find a way to survive. As they investigate the source of the danger, they are forced to re-evaluate their past and confront their darkest secrets, to the point where they can no longer distinguish between the real horror — the real threat of death — and the nightmare within their souls.