Upon their arrival, they discover they will be staying at the most historic castle in all of Scotland, a place teeming with dark secrets and haunting shadows. It seems that Prince Eddy, who had been heir to the throne until his purported death in 1892, has actually been alive all these years. Deemed unfit for the throne, he has been living secretly at Glamis Castle under an assumed name. Only now the prince has gone missing-on the very morning that the body of one of his servants was found, her throat slashed. Now, Charles and his clever Kate must find Eddy and clear his name-while keeping his true identity a secret.