After the battle with Katharine, the rebellion was in tatters. The curse of the Jules legion was unleashed, knocking her out of the battle. Arsinoe must find his cure, in addition to carrying the responsibility of stopping the devastating fog on his shoulders. Mirabella disappears without explanation. Queen Katharine's rule over Fennbirn is barely sustained. The mist attacks and the rebellion finds new allies. Katharine has lost her beloved Pietyr and cannot trust anyone. Will she be able to make a truce with Mirabella and endure the constant onslaught of the dead queens? In this conclusion of the Three Dark Crowns series, the dark sisters will rise to fight each other and against the ancient secrets of the island of Fennbirn. Loyalties will change and ties will be tested ... Many will be broken forever.