A human jawbone found at the Jeffersonian alerts Brennan and the team that the Gormogon serial killer has struck again; a lab explosion lands Zack in the hospital; Gormogon's silver skeleton disappears from the vault.
A teenage boy, who died in a freak accident after learning he was adopted, seeks Melinda's help in finding his birth mother.
Melinda must contend with crash investigators and an evil spirit when she tries to help hundreds of confused passengers killed in a jetliner crash.