Edge of Extinction: The Ark Plan by Laura Martin

A hundred years after scientists brought dinosaurs back to life, humanity has been forced underground. The world above has become a deadly wilderness ruled by prehistoric predators. But when Sky Mundy discovers a message from her missing father—hinting that the surface may hold the key to saving humankind—she defies every rule and ventures into the wild.

With danger lurking at every turn, Sky and her friends must face towering beasts, rival survivors, and the truth about what drove humanity below ground. Fast-paced, gripping, and vividly imagined, Edge of Extinction: The Ark Plan is a thrilling adventure about courage, survival, and reclaiming the lost world.