The mystery of the Sandringham Company, a unit of men from King George V's Norfolk Residence who disappeared in action during the Battle of Gallipoli in 1915, is dramatized in this feature-length drama. Led by fastidious estate manager "Beck" (David Jason), the company was tasked with training and fighting for the war effort, but a strange mist enveloped them and they were never seen again. The film follows an investigator sent after the war to uncover the truth about their fate, tracing their journey from Sandringham to Gallipoli and beyond, revealing a tale of heavy losses, confusion, and tragedy.