Twilight of the Zodiac is the name of the trilogy:

Book 1 · Secrets of Starlit Hearts

Book 2 · Shadows of Broken Oaths

Book 3 · Echoes of Eternal Flames

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As book 1 is already complete, I'll give you an in-depth explanation for the title "Secrets of Starlit Hearts", so you can understand it.

1. Secrets: The story revolves around hidden identities, clandestine alliances, and the mysterious pasts of characters like Seventeen (Serena) and Draco. The rebellion, the manipulation by rulers, and the complex relationships between the characters are all shrouded in secrecy, making this a fitting thematic anchor.

2. Starlit: Stars are often used symbolically to represent destiny, which ties directly to the prophecy that governs the fates of the seven main characters. The Zodiac Archipelago is also tied to astrological signs, further emphasizing the celestial theme.

3. Hearts: This represents the emotional core of the story—love, loyalty, betrayal, and the deep emotional bonds between characters like Seventeen and Draco, the friendships within the group, and the personal struggles each character faces. It highlights the emotional and romantic undercurrents that drive the characters' actions.

Overall, "Secrets of Starlit Hearts" encapsulates both the mystical elements of the Zodiac world I build for this story and the deeply personal, emotional journeys of the characters.