Credit: Kristian Dowling/FOX © 2010 Fox Broadcasting Co. Photo: Branded Bones Bone

In our Season 6 spoiler roundup, we told you about an upcoming episode in which the killer is a deaf and mute teenage girl. But what we didn’t tell you was the title: “The Sign in the Silence.”

Set to air May 5, the episode will center on Brennan (Emily Deschanel) and Booth (David Boreanaz) interrogating an apparent runway found covered in blood and carrying a knife. Without a murder victim, or even knowing if he/she is dead or alive, B&B must find a way to communicate with the young girl. And fast.