The family of Kenia Monge share the agonizing details of what happened around the beautiful, 19-year-old's disappearance. Father Tony Lee, her sister, Kim, and authorities explain how the texts in Kenia's cell phone were the impetus to finding her abductor, who ultimately led them to Kenia.

Hannah Anderson's best friend knew something was wrong when Hannah stopped responding to her texts. No one knew that Hannah had been abducted by someone close to her. Hear the harrowing saga around Hannah's kidnapping and how the amber alert system was used for the first time.

April Millsap's mother recalls the day she asked her 14-year-old daughter April, to text her when she got home from walking the dog. April never did. Instead, she sent a cryptic text to her boyfriend and disappeared. What happened during her outing that changed her family forever?

Successful real estate agent Beverly Carter went missing after showing a home to potential buyers. Later that evening, 50-year-old Beverly began texting her husband. Family and friends recall why the texts seemed suspicious and how they knew without a doubt, that Beverly was in danger.

When Deserae Turner didn't come home after school, her mother and friends began texting her incessantly. A massive search ensued, and 47 of her friends were questioned. Turns out her Snapchat may have been the key to the mystery.

In 2006, Elizabeth Shoaf was abducted near her rural South Carolina home. The teenager was missing for over a week, when a text message came through that infused hope into the case. Hear the dark details of Elizabeth's frightening ordeal from those closest to her.

When Becky Koster returned home from a night out, she texted her mother Barbara that she made it back safely. But, when Barbara arrived home hours later, Becky was nowhere to be found. In her own words, Barbara recalls the gut-wrenching search for her daughter; and how a stranger attempted to derail the investigation through manipulative texts.

Justina Rucinski receives an email with the largest cookie request of her career; but when the customer arrives at her home to leave the deposit, Justina is brutally attacked and taken away at gunpoint; April recalls what happened to her best friend.

One week before Queena Phu's Senior prom, the 18-year-old pulled into her local library to return a book after hours. She was on her cellphone with her best friend, Rachel, who suddenly heard Queena scream--and then the line went dead. Rachel and Queena's family detail how they immediately drove to the scene, only to make a horrifying discovery.