Everyone knows how the the last Moon Princess saved Moonacre from being plunged into eternal darkness. But what about the young man in the shadows? The heir to the De Noir clan. The one who made it possible for Maria to find the Moon Pearls? What did he witness? What hardships and abuse did he shoulder from his father? What could've happened or been said that would make Robin De Noir put everything; his inheritance, title, and even his life; on the line to run to the aid of Maria Merryweather?

Maria Merryweather starts her new life in Moonacre valley with Robin at her side. However, when people start to go missing Maria worry's for the safety of her family. What will Maria do when she finds out her uncle has disappeared?

After the ending of Maria and Moonacre, Maria sets out to do everything she can to make the valley once again a happy thriving place and to fix up her relationship with Robin. But when a new visitor comes to make war in Moonacre can Maria keep everything together? Or will she let Robin go because of it? I welcome you to the slightly darker and romantic side of The Secret of Moonacre.