In 1939, French archaeologist Pierre Montet uncovered an intact royal tomb at Tanis in the Nile Delta, containing a pharaoh buried in a coffin of solid silver, a metal rarer and more prized in ancient Egypt than gold. The find should have rivaled Tutankhamun's tomb for fame, but the outbreak of the Second World War buried the news almost as completely as the sand had buried the burial chamber. This film follows investigators and Egyptologists piecing together who this king, Psusennes I, actually was, ruling during Egypt's fractured Third Intermediate Period, a time of divided thrones and declining power far removed from the glory of the New Kingdom. Interviews and site footage from Tanis trace how Montet's team catalogued the burial's treasures, from silver coffin to gold funerary mask, and set them against what little textual evidence survives about Psusennes's reign. The film's case is straightforward: a discovery this rich deserves to be as well known as the boy king who overshadowed it.