The vacancy on the team due to Prentiss' departure is filled by agent and university linguistics professor Alex Blake, whose arrival affects Garcia and Strauss the most but for different reasons. The first case with this entire new team takes them to Abilene, Texas where Don Dell, a life sentence prisoner, escaped when, during his transfer to a hospital, an accident occurred. The driver and EMT died in the accident, and Don killed the guard, in the process sewing his mouth shut, which is a signature of a past killer never caught coined the Silencer. The last of the Silencer's three murders, all of middle aged brunette working class women and all which were committed in the middle of the night, occurred in 2004, when Don was incarcerated. During his entire incarceration, he never spoke a word. The team is pretty sure he is the Silencer and not a copycat. They have to figure out why silence is a key to his life, and decipher the cryptic messages he is leaving behind in the hopes of being able to determine his whereabouts before he kills again.