The residents agonize over their upcoming exam results; Arizona's childhood friend needs medical help; the doctors try to help a patient who is missing one third of his skull; Julia wants to start a family with Mark.
Booth suspects an organized-crime family when a partial skeleton is found encased in concrete, and he tries to lure the suspected killer out of hiding; Brennan gets a surprise visit from her father (Ryan O'Neal) while visiting her mother's grave.
The BAU works with the NSA when two undercover DEA agents are murdered and another goes missing; Hotch hopes the team's work with the NSA will bring them closer to finding a ring of hit men.
Melinda's first ghost reappears, prompting memories of discovering her ability and the strain it put on her relationship with her mother, who could not understand her situation.
Will tells Francie that he's been investigating the death of Danny. Sydney learns from Vaughn that her father may also be working for the FBI.