On Saturday 22 January 2000, two men found a small holdall, abandoned on an industrial estate in the north of Sheffield. Upon opening the bag they made a gruesome discovery. A badly decomposed body. Who was this person? Why did they die? Where had the body been stored all of this time? In this collection, you’ll learn alongside the experts who worked to determine the identity of Mr. X. You’ll discover the forensic science techniques that were used to identify the body and understand the circumstances surrounding their death.