In 1990, Larry Crichton loses touch with his old pals, William Sawyer and Louis Michael. A bizarre trail from South Dakota to Minnesota ends in a dark discovery and a case gone cold. While investigators question whether a man of God is the key to solving this mystery, they fear blind faith is not only risky, but could prove to be deadly.

In January 1995, Sioux Falls investigators alert the Minneapolis police department about their case involving George Griller, who had taken two elderly men — William Sawyer and Louis Michael — out of state as part of an elder care business he was starting. Griller claimed he did not know the whereabouts of both Sawyer and Michael.

S2/EP15 Detective Terry Crawford says Robert Langley was a manipulator, and if he was free, he would hide in "a bunker" because Langley is such a menace.

S2/EP15 Terralissa Ann Eastburn says she had a close relationship with her mother, who loved to sew and cook. The last time she would see her would be her wedding in Oahu.

S2/EP15 After Annie Gray disappeared, her sister, Judith Powell, asked Langley about her. Not only did he have no answers, but it seemed like he was trying to hypnotize her, Powell and authorities recall.

It has been four days since anyone has heard from Anne Louise Gray, and police in Salem, Oregon, find a man, Robert Paul Langley, in Gray's apartment selling off her things. Gray's sister and her best friend immediately head to her residence, and they find various household items missing, but Gray's closet it still full of her clothes and shoes.

When police were searching for David Thomas, a 55-year-old attorney who vanished from Fort Myers, Florida, they discovered his rental car burned in a remote, wooded area of Lehigh Acres. Finding the car was a huge break in the case, as investigators began exploring the criminality that may have been involved in his disappearance.

While investigating the disappearance of David Thomas, investigators uncover he had a prior brush with the law. Before Thomas vanished, a secretary with whom Thomas was having an affair reported him to police after he broke off their relationship. She told law enforcement Thomas had plans to poison a bottle of wine to kill his wife, Annie Thomas, which Annie believed was implausible.

When a beautiful garden turns into a dark abyss, the serenity in Salem, Oregon, is completely shattered. All is not as it seems as investigators dig deep into the life of a single mom. As all the grisly details begin to unfold, the chase is on to catch a killer.

When a Florida teen tending to some yard work digs up a frightening scene, investigators find themselves in the middle of a twisted affair. A wild trail of evidence leads them across three state lines and the discovery of an astounding truth. Who could have wanted David Thomas killed, and why?

In August 2002, Fort Myers, Florida, attorney David Thomas, 55, vanishes. When his wife Annie reports him missing from their retirement home in Alabama, investigators let her know that David has already been reported missing — by his girlfriend. Annie says it was "awful" finding out about the affair, and investigators question if this was a potential love triangle.

While investigating the disappearance of 55-year-old attorney David Thomas from Fort Myers, Florida, police discover he was having an affair. Even stranger, they find out Thomas withdrew $25,000 in cash in the days before he went missing. Detectives wonder if his disappearance is connected to the affair and the $25,000 withdrawal.

S2/EP13 Brent King, the father of Chelsea King, looks back on the investigation into his daughter's disappearance. Chelsea went missing on February 25, 2010, while she was jogging at the Rancho Bernardo Community Park in San Diego, California. Her body was found several days later buried in a shallow grave. John Albert Gardner III ultimately pleaded guilty to her murder, and he was sentenced to life in prison without the possibility of parole.

S2/EP13 Investigators from San Diego, California, reflect on the cases of 14-year-old Amber Dubois and 17-year-old Chelsea King, who went missing in 2009 and 2010, respectively. In April 2010, John Albert Gardner III pleaded guilty to the rape and murder of both Dubois and King. He was later sentenced to life in prison without the possibility of parole.

S2/EP13 Amber Dubois' mother, Carrie McGonigle, remembers what Dubois was like growing up. Described as an independent teenager and animal lover, Dubois disappeared while walking to school on February 13, 2009. McGonigle said she could not focus at work during the time her daughter was missing. John Albert Gardner III ultimately pleaded guilty to her murder, and he was sentenced to life in prison without the possibility of parole.

Almost a year after 14-year-old Amber Dubois disappeared while walking to school in Escondido, California, 17-year-old Chelsea King vanishes. Her father, Brent King, spots Chelsea's car and her phone at the head of a San Diego running trail, and he jogs down the path in search of his missing daughter.