From Kass Morgan comes a tense and dramatic sequel about survival, secrets, and the terrifying discovery that the hundred may not be alone on Earth after all.

It has been twenty-one days since the hundred landed on Earth, becoming the first humans to set foot on the planet in centuries. They thought they were alone, but signs of an unknown enemy begin to prove otherwise.

As fear spreads through the group, Wells tries to hold everyone together and keep them safe. Clarke sets out toward Mount Weather in search of other colonists, while Bellamy is determined to find and rescue his sister, no matter what it costs.

Meanwhile, back on the ship, Glass faces an impossible choice between the person she loves and her own survival.

As secrets are revealed and loyalties are tested, the hundred must learn that surviving Earth will take more than courage—it will take trust, unity, and the strength to face truths that change everything.

Suspenseful, emotional, and full of danger, Day 21 explores survival, leadership, love, and what happens when everything you believed about the world turns out to be wrong.

✨ Genre: Young Adult / Science Fiction / Dystopian
🌶️ Spice Level: Low
📚 Series: The 100 - Book 2

Fast-paced, tense, and full of twists—perfect for readers who love dystopian survival, space colonies, dangerous secrets, and high-stakes YA sci-fi 🌍🚀📖