Marcia Clark Investigates The First 48 delves into some of America's most shocking crimes that have remained unsolved or ended with controversial outcomes. Each two-hour episode will focus on a specific case and examine the first 48 hours after the crime to reveal new angles and unravel enduring mysteries. Clark's years of experience both as a prosecutor and defense attorney allow her to see the important details that original investigators may have missed. She will sift through evidence presented in the case files, visit significant locations and conduct interviews with key players in an effort to uncover potential new leads. By looking at these cases through the lens of the critical first 48 hours, Clark will strive to discover the truth behind how and why these murders happened.