`Unsolved' is a new limited series that draws from the experiences of Greg Kading and Russell Poole, two former Los Angeles Police Department detectives who led separate investigations into the murders of iconic rappers Tupac Shakur and The Notorious B.I.G. Based on Kading's book `Murder Rap: The Untold Story of the Biggie Smalls & Tupac Shakur Murder Investigations', the series juxtaposes the two investigations alongside flashbacks into the relationship between Tupac and Biggie.