内容简介：
The "Power of Seven" appeared on Earth long after most of the original life forms disappeared into the marshes that would shape the future of this planet, which was evolving along the same geologic lines as our home world. The seven Caretakers and CARL (Computer Aided Research Library) insure that Earth-92 follows the original civilization blueprint. Minor deviations are allowed, but any major deviations are corrected by the current Caretaker after CARL determines that a problem exists. Earth-92 was terraformed nearly 7000 years ago. The first 6 Caretakers worked with CARL to insure that our planet evolved according to the blueprint developed on Earth nearly 30,000 years ago. It is now Ryean's job to assist CARL during the Final Phase of Earth-92's development.