In Washington Township, Michigan, on Valentine's Day, 2007, Stephen Grant filed a missing persons report on his beloved wife, Tara. The stay-at-home father of two was beside himself with despair. Why would Tara abandon him and their family? Was she involved with another man? Stephen's frantic, emotional search for Tara made national headlines, and the case was featured on Dateline among other television shows and news outlets. But key elements in Stephen's story still weren't adding up....

To his parishioners, minister Matt Baker seemed a pious and good man. To his wife, Kari, he was a devoted husband and caring father. Always sunny and vivacious, Kari never questioned their frequent relocations from one small Texas Baptist church to another. Even when tragedy struck, Kari remained strong - until one day, inexplicably, she took her own life.

Josef Fritzl was a 73-year-old retired engineer in Austria. He seemed to be living a normal life with his wife, Rosemarie, and their family - though one daughter, Elisabeth, had decades earlier been "lost" to a religious cult. Throughout the years, three of Elisabeth's children mysteriously appeared on the Fritzls' doorstep; Josef and Rosemarie raised them as their own. But only Josef knew the truth about Elisabeth's disappearance.... For 27 years, Josef had imprisoned and molested Elisabeth in his man-made basement dungeon.

Bright, attractive, and both from good families, University of Texas college student Colton Pitonyak and vibrant redhead Jennifer Cave had the world at their beckoning. Cave, an ex-cheerleader, had just landed an exciting new job, while a big-money scholarship to UT's prestigious business school lured Pitonyak to Austin. Yet the former altar boy had a dark, unpredictable streak. When Jennifer failed to show up for work on August 18, 2005, her mother became frightened. Sharon Cave's search led to Colton's West Campus apartment, where Jennifer's family discovered a scene worthy of the grisliest horror movie.

On the morning of July 18, 2014, 41-year-old Florida State law professor Dan Markel dropped his boys off at preschool, hit the gym, and headed home to his quiet, tree-canopied neighborhood. Within seconds of pulling into his garage, two .38-caliber bullets fired from point-blank range were lodged in his brain. His brutal slaying defied explanation.