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"The Book of Shadows" -- Coverage of the CBS series CSI: CRIME SCENE INVESTIGATION, scheduled to air on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" - Det. Kevin Crawford (Alimi Ballard, left) and Nick Stokes (George Eads) are in the home of chemistry teacher Chet Messner taking a look at some of his belongings after his science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Nick Stokes (George Eads) looks up briefly while he searches the home of chemistry teach Chet Messner after his science experiement went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Student Mason Brewer (Nathan Gamble, left) and D.B. Russell (Ted Danson) look as someone gets their attention during the investigation of a chemistry teacher's science experiment that went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Morgan Brody (Elisabeth Harnois, left) and D.B. Russell (Ted Danson) await someone's entrance into the room after solving the case of a chemistry teacher's science experiment that went horrible wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Det. Kevin Crawford (Alimi Ballard) ponders the next move for the CSI team after searching the home of chemistry teacher Chet Messner after his science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Coverage of the CBS series CSI: CRIME SCENE INVESTIGATION, scheduled to air on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" - Teacher Rebecca Brewer (Myndy Crist, left) and her son Mason Brewer (Nathan Gamble) await to be questioned after a chemistry teacher's science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Teacher Rebecca Brewer (Myndy Crist) answers questions dealing with a chemistry teacher's science experiment that went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Nick Stokes (George Eads) holds up a container of what appears to be some sort of powder while searching chemistry teacher Chet Messner's home after his science experiment when horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Nick Stokes (George Eads) is wondering what's in the container he's holding up in the home of chemistry teacher Chet Messner after his science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- D.B. Russell (Ted Danson) reads a phrase from a book he found in chemistry teacher Chet Messner's home after his science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- D.B. Russell (Ted Danson, left) listens as Morgan Brody (Elisabeth Harnois) shows him something on her laptop while they investigate a chemistry teacher's science experiment that went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Coverage of the CBS series CSI: CRIME SCENE INVESTIGATION, scheduled to air on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

The Book of Shadows" -- Nick Stokes (George Eads, left) and D.B. Russell (Ted Danson) search the home of chemistry teacher Chet Messner and develop more questions as to why Messner's science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Morgan Brody (Elisabeth Harnois, left) speaks to teacher Rebecca Brewer (Myndy Crist, center) about a chemistry teacher's science experiment that when horribly wrong as her son Mason Brewer (Nathan Gamble) watches, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Sonja Flemming/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Nick Stokes (George Eads) left) and D.B. Russell (Ted Danson) focus in on a table with various items that belonged to chemistry teacher Chet Messner who had a science experiment that went terrible wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- D.B. Russell (Ted Danson) ultimately amuses Nick Stokes (George Eads) when he reads a section from a book while they search the home of chemistry teacher Chet Messner after his science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved

"The Book of Shadows" -- Nick Stokes (George Eads, left) disagrees with D.B. Russell (Ted Danson) and the meaning of the sign displayed while they search the home of a chemistry teacher whose science experiment went horribly wrong, on CSI: CRIME SCENE INVESTIGATION, Sunday, Oct. 19 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Michael Yarish/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved