Everyone at the Royal Court was so excited today - the marvellous Frost Fair has come to London, and we all went ice skating! But there was a terrible discovery when the body of a man was found at the edge of the frozen river. Why was he killed, and what is the meaning of the silver coins placed over his eyes? Are they a message - or a warning? As the Queen's own special investigator, I, Lady Grace, must uncover the truth . . .