The Reach is in turmoil. As the conflict escalates, casualties begin to mount on all sides. Nowhere is safe. Now, time is running out. The deadline for escaping the planet is drawing ever closer with each passing hour. For Knile Oberend and his companions, there is only one option left. They must take their chances and journey through the mysterious Sunspire. There is no other way. Sunspire (Book 4 of the Reach) is the final chapter in the epic saga of the last days of Earth.