World famous prosecutor, Marcia Clark, investigates the bone chilling, unresolved death of toddler Caylee Anthony. Was this beautiful little girl murdered by her own mother, Casey Anthony? With a visceral connection to the case, Marcia leaves no stone unturned as she attempts to discover the truth buried deep within the First 48.

World famous prosecutor, Marcia Clark, investigates the disappearance of 23-year-old mother of four, Stacy Peterson, who vanished without a trace. As the world searched for her, all eyes began to focus on her cop husband Drew Peterson when it was discovered his previous wife died suspiciously. Is Drew Peterson responsible for both of his wives' deaths? Marcia will dissect the first 48 hours of this case to try to discover exactly what happened to Stacy Peterson.

Marcia examines the mysterious death of Chandra Levy, the Washington, D.C., intern who had an alleged affair with Congressman Gary Condit; with no one held accountable for Chandra's brutal murder, Marcia digs deeper for an answer.

Marcia attempts to uncover the truth behind the unsolved murder of actor Robert Blake's wife, Bonnie Lee Bakley; determined to find Bakley's killer, Marcia scrutinizes this twisted Hollywood tale to separate the facts from the fiction.

The body of Rebecca Zahau, the girlfriend of pharmaceutical tycoon Jonah Shacknai, is found tied, gagged and hanging naked outside her boyfriend's seaside mansion; law enforcement determines her death was a suicide, but suspicions remain.

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Marcia investigates if Billionaire Boys Club leader Joe Hunt was so obsessed with money and power that he became a cold-blooded killer, or if he was scammed by one of the world's best con artists.