As Hotch fights for his life after being stabbed, he has visions of his late wife and his nemesis; when a teen goes missing, suspicions arise about her estranged father.
A petty officer is found murdered on a golf course; McGee tries to locate a key witness by spending hours on the victim's ham radio; Palmer asks his co-workers to donate to a charity.
Melinda's new neighbor is being haunted by his friend's dead grandfather, who suspects that the man killed his granddaughter.
Believing a honeymoon couple may have been abducted, the team heads to Belize to investigate the disappearance.
Alex uses an unconventional treatment to save a dying patient. A Halloween-hating couple tests Iris’s limits.