While shooting a video on the corridor of his high school showing his mates and the school, Mason Brewer hears an explosion. Out of the blue, the chemistry teacher Chet Messner runs through the corridor on fire and dies completely burned. The first impression of the CSIs is that some experiment has gone awry in Chet's classroom, but they find a threatening message in his cell phone. Greg and Morgan process the room and learn that he was preparing his class. Soon they discover that the threatening message came from Mason's phone, and he is brought with his mother to the station for interrogation. Mason is a geek and was upset with his B+ since he was ill, reason why he sent the message that he copied from a movie. Dr. Robbins finds that Chet was poisoned by cyanide and could have had a seizure on the fire of his experiment. They also find a life rune, which is a gang symbol, and was buying large quantities of red phosphorus powder, component for preparing meth. Det. Crawford and Nick go to Chet's house and find a bloody knife and The Book of Shadows. Soon they find that Chet was making witchcraft, and not meth, and his coven was performing a banishment spell on Chet. Now the course of the investigation change.
"The Book of Shadows" is a strange episode of "CSI", with the story of a sect. It is difficult to believe that a group of teachers, including a chemistry teacher, form a Wicca coven and practice witchcraft in a crime story involving a group of scientists. The are better and better and more credible episodes of "CSI". My vote is six.
Title (Brazil): "The Book of Shadows"