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- Season 4 overviewApr 4, 2011-Jan 2, 201214 episodesSeason 4 episodes14. Innocence Lost Jan 2, 2012
- A man's father develops an unseemly interest in his son's girlfriend before she goes missing.
- 13. The Wedding Ring Dec 19, 2011
- A shocking discovery ignites a renewed search for Tina McQuaig who vanished after leaving work.
- 12. Midnight Walk Dec 12, 2011
- Single mother Lily Aramburo goes missing after leaving her fiancé's Miami condominium at 2 a.m.
- 11. Vanished in Vermont Dec 5, 2011
- Missing teen Brianna Maitland's car is found at farmhouse with her wallet and paycheck inside.
- 10. Mystery on Lake Seminole Nov 28, 2011
- Police suspect foul play when Mike Williams disappears while duck hunting.
- 9. Spring Break Nightmare Nov 21, 2011
- Teenager Colleen Orsborn goes missing after skipping school to go to the beach.
- 8. Memory Lane Nov 14, 2011
- Amber Gerweck disappears and her car turns up approximately 600 miles away from her Michigan home.
- 7. A Father's Quest Nov 7, 2011
- A woman disappears in New Mexico after moving there to make a fresh start.
- 6. The Dark Ravine Oct 31, 2011
- A vanished woman's brother may be involved in her disappearance.
- 5. Missing Valentine Oct 24, 2011
- After a seemingly normal phone call, a woman is never heard from again.
- 4. Game Over Apr 25, 2011
- Charlie Allen Jr. never shows up at a party, then tells his sister that people are after him.
- 3. Heavy Metal Mystery Apr 18, 2011
- Morgan Harrington gets separated from her friends at a concert and disappears.
- 2. Secrets of a Son Apr 11, 2011
- A Church going young journalist's car is found abandoned near Las Vegas.
- 1. Running for Her Life Apr 4, 2011
- Nineteen-year-old college student Rachel Cooke goes for a jog and disappears without a trace.