Documentary following archaeologists working on a 4,000-year-old pyramid containing a burial chamber, still apparently sealed. As light enters the tomb for the first time, the artefacts contained within reveal a gripping detective story as although there are no signs of entry, the contents have been disturbed. To solve the mystery, Egyptologists explore the nearby Black Pyramid to see how pyramid builders used every trick in the book to protect the treasures, discovering a dark and complex labyrinth of dummy tombs, false passages and stone portcullises to fool robbers.