London, 1899. Daniel Wilson and Abigail Fenton, the museum detectives, are called upon to investigate a bizarre murder at the White Tower, the heart of the Tower of London. The dead body of a Yeoman is found inside a suit of armour belonging to Henry VIII, having been run through with a sword. When details of this suspicious outrage are reported to the Prince of Wales, he fears this may be an expression of Republican unrest and calls upon Wilson and Fenton to investigate further. As their inquiries proceed, Wilson and Fenton learn about the long and bloody history of the Tower of London, unlocking hidden secrets at the heart of the mysterious deaths.