When the Kingdom is engulfed in flames, Fire Glass doesn't burn. The night of Princess Rhiannon's official anointing is also the night of the Grand Peace Talks between all the Elemental Fae Royal families. But the Dark Fae Lord has plans of his own. Coming out of hiding after eighteen years, he decides to make an appearance and attack the Fire Fae castle with his signature blue flames. If the Fire Fae can't fight against the mystic flames of the Dark Lord, who can? What is the fate of the Royal Elemental Fae families, and will anyone survive? Holly Black meets Victoria Aveyard in this new tale full of Royal Fae mischief, secrets, betrayal, and loads of intrigue.