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Walsh profiles dangerous duos wanted for fraud, child molestation or murder.

Female fugitives in America; a dancer proves she will use any weapon to carry out her revenge.

John Walsh hunts traffickers who hold women and children against their will; an undercover sting rescues a woman from her pimp; the Vancouver, Wash. police attempt to rescue women who are being trafficked.

Criminals betray loved ones; a husband's murder-for-hire plot; a father shoots his daughters; sexual abuse.

A professional billiards player is killed; a jealous lover is accused of killing a teacher; John Walsh looks into the impact of social media on the search for missing people and the tools used to track down pedophiles.

A child rapist and murderer flaunts his crimes in a series of clues targeted toward other children; an alleged killer sends a letter to a newspaper confessing his guilt.