The Scottish Highlands keep many legends, and the most mysterious of them is the tale of the Cursed Sword, once stolen from the hero William Wallace, nicknamed Braveheart, by the servants of the warlock king Robert the Bruce. A fairy tale? A theme for countless ballads? But already in the 19th century, Mary Egton, a young lady who comes to stay at the mountain castle of her fiancé, Lord Ruthven, accidentally learns that the legend is based on the TRUTH. The truth about a terrible, unsolved crime, the threads of which stretch from the past to the PRESENT. However, it seems that Mary learned TOO A LOT, and now her life is in danger. Unexpectedly, the great writer and born private detective Sir Walter Scott, who is also interested in the mystery of the Cursed Sword, comes to her aid...